Enphase Energy Reports Financial Results for the Fourth Quarter of 2020

Petaluma, California, UNITED STATES


FREMONT, Calif., Feb. 09, 2021 (GLOBE NEWSWIRE) -- Enphase Energy, Inc. (NASDAQ: ENPH), a global energy management technology company and the world’s leading supplier of microinverter-based solar-plus-storage systems, announced today financial results for the fourth quarter of 2020, which included the summary below from its President and CEO, Badri Kothandaraman.

We reported revenue of $264.8 million in the fourth quarter of 2020, along with 40.2% for non-GAAP gross margin. We shipped approximately 762 megawatts DC, or 2,292,132 microinverters.

The financial highlights for the fourth quarter of 2020 are listed below. The GAAP numbers include an approximate $16.5 million approved refund on tariffs that were previously paid on microinverters imported to the U.S. from China. The tariff refund is excluded from all non-GAAP numbers.

  • Revenue of $264.8 million
  • Cash flow from operations of $84.2 million; ending cash balance of $679.4 million
  • GAAP gross margin of 46.0%; non-GAAP gross margin of 40.2%
  • GAAP operating income of $79.1 million; non-GAAP operating income of $72.4 million
  • GAAP net income of $73.0 million; non-GAAP net income of $71.3 million
  • GAAP diluted earnings per share of $0.50; non-GAAP diluted earnings per share of $0.51

Our revenue and earnings for the fourth quarter of 2020 are provided below, compared with those of the prior quarter and the year ago quarter:

(In thousands, except per share data and percentages)

 GAAP Non-GAAP
 Q4 2020 Q3 2020 Q4 2019* Q4 2020 Q3 2020 Q4 2019*
Revenue$264,839  $178,503  $210,032  $264,839  $178,503  $210,032 
Gross margin46.0% 53.2% 37.1% 40.2% 41.0% 37.3%
Operating expenses$42,824  $43,222  $33,439  $34,193  $29,571  $26,140 
Operating income$79,114  $51,759  $44,442  $72,356  $43,675  $52,277 
Net income$72,991  $39,362  $116,666  $71,342  $41,760  $52,038 
Basic EPS$0.57  $0.31  $0.95  $0.56  $0.33  $0.42 
Diluted EPS$0.50  $0.28  $0.88  $0.51  $0.30  $0.39 
                        
* Revenue for the fourth quarter of 2019 of $210.0 million included approximately $36.4 million of safe harbor revenue.

Our revenue and earnings for the fiscal year 2020 are given below, compared with those of the prior year:

(In thousands, except per share data and percentages)

 GAAP Non-GAAP
 FY 2020 FY 2019 FY 2020 FY 2019
Revenue$774,425  $624,333  $774,425  $624,333 
Gross margin44.7% 35.4% 40.1% 35.7%
Operating expenses$159,542  $118,516  $118,296  $95,943 
Operating income$186,439  $102,729  $192,504  $126,952 
Net income$133,995  $161,148  $188,526  $124,205 
Basic EPS$1.07  $1.38  $1.50  $1.06 
Diluted EPS$0.95  $1.23  $1.37  $0.95 

We accelerated our progress on digital transformation. We recently completed the acquisition of Sofdesk Inc. in the first quarter of 2021. Sofdesk is a leading provider of design software for residential solar installers and roofing companies. We also recently signed a definitive agreement to acquire the Solar Design Services business of DIN Engineering Services LLP. The business provides proposal drawings and permit plan sets to installers with rapid turnaround and high precision. These acquisitions are expected to enhance the capabilities of our digital platform, enabling our installers to simplify the sales process and improve the buying experience for homeowners.

Our non-GAAP gross margin was 40.2% in the fourth quarter of 2020, compared to 41.0% in the third quarter due to higher shipping and logistics costs. We experienced constraints in the global semiconductor supply chain during the quarter and expedited products to meet customer demand. Non-GAAP operating expenses increased to $34.2 million in the fourth quarter of 2020, compared to $29.6 million in the prior quarter, primarily due to increased hiring and R&D. Non-GAAP operating income was $72.4 million, compared to $43.7 million in the prior quarter.

We exited the fourth quarter of 2020 with $679.4 million in cash and generated $84.2 million in cash flow from operations. Inventory was $41.8 million at the end of the fourth quarter of 2020, compared to $37.5 million at the end of the third quarter of 2020. The sequential increase in inventory was driven by the planned increase of raw materials for our Enphase Storage systems in anticipation of the production ramp in 2021.

Strong demand for our microinverter systems across all regions continued in the fourth quarter of 2020, while shipments of our newly ramped Enphase Storage systems increased approximately 35% compared to the third quarter. We achieved record microinverter system sell-through from distributors to installers in the fourth quarter of 2020, resulting in lower than usual channel inventory as we exited the quarter.

For the full year 2020, revenue was $774.4 million, compared to $624.3 million in 2019. We generated a record $198.9 million free cash flow in 2020, compared to $124.3 million in 2019. GAAP net income was $134.0 million, resulting in diluted earnings per share of $0.95. Non-GAAP net income was $188.5 million, resulting in diluted earnings per share of $1.37. We are pleased to report that 2020 was a record year for non-GAAP profitability and free cash flow generation.

BUSINESS HIGHLIGHTS

On Nov. 9, 2020, Enphase Energy announced that Cutler Bay Solar Solutions, Florida’s largest family-owned solar-plus-storage installation company, deployed more than 1.5 MWh of Enphase Storage systems. The installations include a combination of Enphase Encharge 10™ and Encharge 3™ storage systems, which offer usable and scalable battery storage capacities of approximately 10.1 kWh and 3.4 kWh, respectively.

On Nov. 12, 2020, Enphase Energy announced a strategic partnership with DMEGC Solar to develop high-efficiency Enphase Energized™ AC modules (ACM) for the European residential solar market. These ACMs are currently available in France and the Netherlands.

On Dec. 14, 2020, Enphase Energy announced the launch of its Enphase Installer Network (EIN) in Australia. The EIN recognizes a network of trusted installers that deliver exceptional homeowner experiences using Enphase products and enables them to grow their business with a range of innovative digital tools and exclusive benefits.

On Jan. 6, 2021, Enphase Energy announced the expansion of its long-term relationship with Sunnova International Inc. to include Enphase Storage systems. Sunnova will empower its network of solar dealers in the U.S. to provide a simple upgrade path for existing Enphase homeowners as well as homeowners who are new to solar and storage.

On Jan. 14, 2021, Enphase Energy announced that Solar Optimum, an EIN Platinum member, will start offering Enphase Storage systems with a team dedicated to growing Enphase storage adoption and promoting Enphase’s all-in-one solar plus storage products as the premier home energy management solution.

On Jan. 26, 2021, Enphase Energy announced the closing of its acquisition of Sofdesk Inc., headquartered in Montreal, Canada. Sofdesk’s Solargraf™ integrated software platform offers the industry’s leading digital tools and services designed to simplify and accelerate the end-to-end sales process across the residential solar industry. Sofdesk also offers Roofgraf™, a software product that enables roofing contractors to generate homeowner proposals using advanced machine learning technology.

On Feb. 3, 2021, Enphase Energy announced that Momentum Solar will now promote and install Enphase Storage systems in addition to Enphase Solar systems as its all-in-one home energy management solution to homeowners. Momentum Solar currently serves customers throughout the U.S. with operations in New Jersey, New York, Connecticut, Pennsylvania, Florida, Texas, California, and Nevada.

On Feb. 8, 2021, Enphase Energy announced that it has agreed to acquire the Solar Design Services business of DIN Engineering Services LLP. Based in Noida, India, the business is a leading provider of outsourced proposal drawings and permit plan sets for residential solar installers in North America. The acquisition is subject to customary closing conditions and regulatory approvals and is currently expected to close by March 31, 2021.

FIRST QUARTER 2021 FINANCIAL OUTLOOK

For the first quarter of 2021, Enphase Energy estimates both GAAP and non-GAAP financial results as follows:

  • Revenue to be within a range of $280.0 million to $300.0 million; revenue guidance does not include any safe harbor shipments
  • GAAP gross margin to be within a range of 37.0% to 40.0%, as there are no remaining tariff refunds pending approval; non-GAAP gross margin to be within a range of 38.0% to 41.0%, excluding stock-based compensation expenses
  • GAAP operating expenses to be within a range of $64.0 million to $67.0 million, including $22.0 million estimated for stock-based compensation expenses and acquisition related costs and amortization
  • Non-GAAP operating expenses to be within a range of $42.0 million to $45.0 million, excluding $22.0 million estimated for stock-based compensation expenses and acquisition related costs and amortization

All estimates for the first quarter of 2021 include Sofdesk, but do not include DIN’s Solar Design Services business.

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Use of Non-GAAP Financial Measures

The Company has presented certain non-GAAP financial measures in this press release. To view a description of non-GAAP financial measures used and the non-GAAP reconciliation schedule for the periods presented, click here.

Conference Call Information

Enphase Energy will host a conference call for analysts and investors to discuss its fourth quarter 2020 results and first quarter 2021 business outlook today at 4:30 p.m. Eastern Time (1:30 p.m. Pacific Time). The call is open to the public by dialing (877) 644-1284; participant passcode 2196494. A live webcast of the conference call will also be accessible from the “Investor Relations” section of the Company’s website at investor.enphase.com. Following the webcast, an archived version will be available on the website for approximately one year. In addition, an audio replay of the conference call will be available by calling (855) 859-2056; participant passcode 2196494, beginning approximately one hour after the call.

Forward-Looking Statements

This press release contains forward-looking statements, including statements related to Enphase Energy’s expectations as to future financial performance, expense levels, liquidity sources, the capabilities, advantages, and performance of our technology and products, including the ability to simplify and speed up solar installation sales processes, our business strategies and anticipated demand for our products, the capabilities and performance of our partners, and the impact to homeowners. These forward-looking statements are based on the Company’s current expectations and inherently involve significant risks and uncertainties. Enphase Energy’s actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of certain risks and uncertainties including those risks described in more detail in the Company’s most recent Annual Report on Form 10-K and other documents on file with the SEC and available on the SEC’s website at www.sec.gov. Enphase Energy undertakes no duty or obligation to update any forward-looking statements contained in this release as a result of new information, future events or changes in its expectations, except as required by law.

A copy of this press release can be found on the investor relations page of Enphase Energy’s website at investor.enphase.com.

About Enphase Energy, Inc.

Enphase Energy, a global energy technology company, delivers smart, easy-to-use solutions that manage solar generation, storage and communication on one intelligent platform. The Company revolutionized the solar industry with its microinverter technology and produces a fully integrated solar-plus-storage solution. Enphase has shipped more than 32 million microinverters, and approximately 1.4 million Enphase-based systems have been deployed in more than 130 countries. For more information, visit www.enphase.com.

Enphase Energy, Enphase, the E logo, Encharge 3, Encharge 10, Enphase Energized, and other trademarks or service names are the trademarks of Enphase Energy, Inc. Solargraf and Roofgraf are the trademarks of Sofdesk Inc. Other names are for informational purposes and may be trademarks of their respective owners.

Contact:
Adam Hinckley
Enphase Energy, Inc.
Investor Relations
ir@enphaseenergy.com
+1-707-763-4784 x7354

 
 
ENPHASE ENERGY, INC.
 
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands, except per share data)
(Unaudited)
    
 Three Months Ended Years Ended December 31,
 December 31,
2020
 September 30,
2020
 December 31,
2019
 December 31,
2020
 December 31,
2019
Net revenues$264,839  $178,503  $210,032  $774,425  $624,333 
Cost of revenues (1)142,901  83,522  132,151  428,444  403,088 
Gross profit121,938  94,981  77,881  345,981  221,245 
Operating expenses:         
Research and development15,801  15,052  11,168  55,921  40,381 
Sales and marketing14,139  14,645  10,690  52,927  36,728 
General and administrative12,884  13,525  10,450  50,694  38,808 
Restructuring charges    1,131    2,599 
  Total operating expenses42,824  43,222  33,439  159,542  118,516 
Income from operations79,114  51,759  44,442  186,439  102,729 
Other expense, net         
Interest income673  110  815  2,156  2,513 
Interest expense(5,901) (5,993) (2,303) (21,001) (9,691)
Other expense, net(2,534) (1,031) 1,467  (3,836) (5,437)
Change in fair value of derivatives (2)      (44,348)  
  Total other expense, net(7,762) (6,914) (21) (67,029) (12,615)
Income before income taxes71,352  44,845  44,421  119,410  90,114 
Income tax benefit (provision)1,639  (5,483) 72,245  14,585  71,034 
Net income$72,991  $39,362  $116,666  $133,995  $161,148 
          
Net income per share:         
Basic$0.57  $0.31  $0.95  $1.07  $1.38 
Diluted$0.50  $0.28  $0.88  $0.95  $1.23 
Shares used in per share calculation:         
Basic126,980  126,109  122,630  125,561  116,713 
Diluted145,990  141,820  132,872  141,918  131,644 

(1) We sought refunds totaling approximately $38.9 million plus $0.6 million accrued interest on tariffs previously paid from September 24, 2018 to March 31, 2020 for certain microinverters that qualify for the tariff exclusion on Chinese imported microinverter products that fit the dimensions and weight limits within a Section 301 Tariff exclusion under U.S. note 20(ss)(40) to subchapter III of chapter 99 of the Harmonized Tariff Schedule of the United States. The refund request was subject to review and approval by the U.S. Customs and Border Protection; therefore, we assessed the probable loss recovery in the three and twelve months ended December 31, 2020 was equal to the $16.5 million and $39.5 million, respectively, approved refund requests available to us prior to the date our financial statements are expected to be issued. As of the three and twelve months ended December 31, 2020, we have recorded $15.9 million and $38.9 million, respectively as a reduction to cost of revenues, and $0.6 million as interest income, in our consolidated statements of operations as the approved refunds relate to paid tariffs previously recorded to cost of revenues, therefore, we recorded the corresponding approved tariff refunds as credits to cost of revenues in the current period.

(2)  Change in fair value of derivatives of $44.3 million for the year ended December 31, 2020, represents changes in fair value of the conversion option in the Notes due 2025, as well as the convertible note hedge and warrant transactions. Initially, conversion of the Notes due 2025 would be settled solely in cash as a result of the Company not having the necessary number of authorized but unissued shares of its common stock available to settle the conversion option of the Notes due 2025 in shares; therefore, the conversion option, convertible note hedge and warrant transactions were classified as derivatives that required marked-to-market accounting. On May 20, 2020, at the Company’s annual meeting of stockholders, the stockholders approved an amendment to its certificate of incorporation to increase the number of authorized shares of the Company’s common stock. As a result, the Company will now be able to settle the Notes due 2025, convertible notes hedge and warrants through payment or delivery, as the case may be, of cash, shares of its common stock or a combination thereof, at the Company’s election. Accordingly, on May 20, 2020, the conversion option, convertible note hedge and warrant transactions were remeasured at fair value and were then reclassified to additional paid-in-capital in the condensed consolidated balance sheet in the second quarter of 2020 and are no longer remeasured as long as they continue to meet the conditions for equity classification.

ENPHASE ENERGY, INC.
 
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands)
(Unaudited)
 
 December 31,
2020
 December 31,
2019
ASSETS   
Current assets:   
Cash and cash equivalents$679,379  $251,409 
Restricted cash  44,700 
Accounts receivable, net182,165  145,413 
Inventory41,764  32,056 
Prepaid expenses and other assets29,756  26,079 
  Total current assets933,064  499,657 
Property and equipment, net42,985  28,936 
Operating lease, right of use asset, net17,683  10,117 
Intangible assets, net28,808  30,579 
Goodwill24,783  24,783 
Other assets59,875  44,620 
Deferred tax assets, net92,904  74,531 
  Total assets$1,200,102  $713,223 
LIABILITIES AND STOCKHOLDERS’ EQUITY   
Current liabilities:   
Accounts payable$72,609  $57,474 
Accrued liabilities76,542  47,092 
Deferred revenues, current47,665  81,783 
Warranty obligations, current11,260  10,078 
Debt, current325,967  2,884 
  Total current liabilities534,043  199,311 
Long-term liabilities:   
Deferred revenues, noncurrent125,473  100,204 
Warranty obligations, noncurrent34,653  27,020 
Other liabilities17,042  11,817 
Debt, noncurrent4,898  102,659 
  Total liabilities716,109  441,011 
  Total stockholders’ equity483,993  272,212 
Total liabilities and stockholders’ equity$1,200,102  $713,223 
        


ENPHASE ENERGY, INC.
 
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
(Unaudited)
 
 Three Months Ended Year Ended
 December 31,
2020
 September 30,
2020
 December 31,
2019
 December 31,
2020
 December 31,
2019
Cash flows from operating activities:         
Net income$72,991  $39,362  $116,666  $133,995  $161,148 
Adjustments to reconcile net income to net cash provided by operating activities:         
Depreciation and amortization4,475  4,765  2,568  17,225  14,119 
Provision for doubtful accounts171  69  (191) 425  217 
Asset impairment    1,124    1,124 
Loss on partial repurchase of convertibles notes due 20243,037      3,037   
Deemed repayment of convertible notes due 2024 attributable to accreted debt discount(3,132)     (3,132)  
Non-cash interest expense5,309  5,422  1,908  18,825  6,081 
Financing fees on extinguishment of debt        2,152 
Fees paid for repurchase and exchange of convertible notes due 2023        6,000 
Stock-based compensation8,289  14,399  6,176  42,503  20,176 
Change in fair value of derivatives      44,348   
Deferred income taxes(2,610) 5,060  (73,375) (17,117) (73,375)
Changes in operating assets and liabilities:         
Accounts receivable(57,854) (32,633) (12,606) (34,321) (68,745)
Inventory(4,229) (6,349) (1,825) (9,708) (15,789)
Prepaid expenses and other assets(3,307) (917) (5,659) (13,758) (14,293)
Accounts payable, accrued and other liabilities44,895  26,189  3,544  35,695  22,200 
Warranty obligations2,134  5,872  2,474  8,815  5,804 
Deferred revenues14,011  6,262  61,467  (10,498) 72,248 
   Net cash provided by operating activities84,180  67,501  102,271  216,334  139,067 
Cash flows from investing activities:         
Purchases of property and equipment(8,851) (3,903) (7,420) (20,558) (14,788)
Purchase of investment in private company(5,010)     (5,010)  
   Net cash used in investing activities(13,861) (3,903) (7,420) (25,568) (14,788)
Cash flows from financing activities:         
Issuance of convertible notes, net of issuance costs    (68) 312,420  127,413 
Purchase of convertible note hedges      (89,056) (36,313)
Sale of warrants      71,552  29,818 
Fees paid for repurchase and exchange of convertible notes due 2023        (6,000)
Principal payments and financing fees on debt(306) (636) (198) (2,575) (45,855)
Partial repurchase of convertible notes due 2024(40,728)     (40,728)  
Proceeds from exercise of equity awards and employee stock purchase plan3,687  (138) 2,060  8,395  4,985 
Payment of withholding taxes related to net share settlement of equity awards(16,288) (8,390) (3,760) (68,330) (8,198)
   Net cash provided by financing activities(53,635) (9,164) (1,966) 191,678  65,850 
   Effect of exchange rate changes on cash and cash equivalents903  104  178  826  (257)
Net increase in cash, cash equivalents and restricted cash17,587  54,538  93,063  383,270  189,872 
Cash, cash equivalents and restricted cash—Beginning of period661,792  607,254  203,046  296,109  106,237 
Cash. cash equivalents and restricted cash—End of period$679,379  $661,792  $296,109  $679,379  $296,109 

(1)  As of December 31, 2020, we have received $24.8 million of tariff refunds and accrued for $14.7 million tariff refunds that were approved, however, not yet received on or before December 31, 2020. In the three months and twelve months ended December 31, 2020, we have recorded $15.9 million and $38.9 million, respectively, as a reduction to cost of revenues, and $0.6 million as interest income, in our consolidated statements of operations as the approved refunds relate to paid tariffs previously recorded to cost of revenues, therefore, we recorded the corresponding approved tariff refunds as credits to cost of revenues in the current period. The tariff refund receivable of $14.7 million is recorded as a reduction of accounts payable to Flex Ltd. and affiliates (“Flex”), our manufacturing partner and the importer of record who will first receive the tariff refunds, on the condensed consolidated balance sheet as of December 31, 2020.

 
ENPHASE ENERGY, INC.
 
RECONCILIATION OF NON-GAAP FINANCIAL MEASURES
(In thousands, except per share data and percentages)
(Unaudited)
 
 Three Months Ended Year Ended
 December 31,
2020
 September 30,
2020
 December 31,
2019
 December 31,
2020
 December 31,
2019
Gross profit (GAAP)$121,938  $94,981  $77,881  $345,981  $221,245 
Stock-based compensation522  1,294  536  3,759  1,650 
Tariff refunds(15,911) (23,029)   (38,940)  
Gross profit (Non-GAAP)$106,549  $73,246  $78,417  $310,800  $222,895 
          
Gross margin (GAAP)46.0% 53.2% 37.1% 44.7% 35.4%
Stock-based compensation0.2% 0.7% 0.2% 0.5% 0.3%
Tariff refunds(6.0)% (12.9)% % (5.1)% %
Gross margin (Non-GAAP)40.2% 41.0% 37.3% 40.1% 35.7%
          
Operating expenses (GAAP)$42,824  $43,222  $33,439  $159,542  $118,516 
Stock-based compensation (1)(7,767) (13,105) (5,623) (38,744) (17,791)
Restructuring and asset impairment charges    (1,131)   (2,599)
Acquisition related expenses and amortization(864) (546) (545) (2,502) (2,183)
Operating expenses (Non-GAAP)$34,193  $29,571  $26,140  $118,296  $95,943 
          
(1) Includes stock-based compensation as follows:         
Research and development$3,271  $4,248  $1,642  $12,701  $4,897 
Sales and marketing2,044  3,952  1,778  11,548  5,678 
General and administrative2,452  4,905  2,203  14,495  7,216 
Total$7,767  $13,105  $5,623  $38,744  $17,791 
          
Income from operations (GAAP)$79,114  $51,759  $44,442  $186,439  $102,729 
Stock-based compensation8,289  14,399  6,159  42,503  19,441 
Tariff refunds(15,911) (23,029)   (38,940)  
Restructuring and asset impairment charges    1,131    2,599 
Acquisition related expenses and amortization864  546  545  2,502  2,183 
Income from operations (Non-GAAP)$72,356  $43,675  $52,277  $192,504  $126,952 
          
Net income (GAAP)$72,991  $39,362  $116,666  $133,995  $161,148 
Stock-based compensation8,289  14,399  6,159  42,503  19,441 
Tariff refunds(16,538) (23,029)   (39,567)  
Restructuring and asset impairment charges    1,131    2,599 
Acquisition related expenses and amortization864  546  545  2,502  2,183 
Non-recurring debt prepayment fees and non-cash interest5,309  5,422  1,908  18,825  13,205 
Loss on partial settlement of Notes due 20243,037      3,037   
 Three Months Ended Year Ended
 December 31,
2020
 September 30,
2020
 December 31,
2019
 December 31,
2020
 December 31,
2019
Change in fair value of derivatives      44,348   
Non-GAAP income tax adjustment(2,610) 5,060  (74,371) (17,117) (74,371)
Net income (Non-GAAP)$71,342  $41,760  $52,038  $188,526  $124,205 
          
Net income (loss) per share, basic (GAAP)$0.57  $0.31  $0.95  $1.07  $1.38 
Stock-based compensation0.07  0.12  0.05  0.34  0.17 
Tariff refunds(0.13) (0.18)   (0.32)  
Restructuring and asset impairment charges    0.01    0.02 
Acquisition related expenses and amortization0.01      0.02  0.02 
Non-recurring debt prepayment fees and non-cash interest0.04  0.04  0.02  0.15  0.11 
Loss on partial settlement of Notes due 20240.02      0.03   
Change in fair value of derivatives      0.35   
Non-GAAP income tax adjustment(0.02) 0.04  (0.61) (0.14) (0.64)
Net income per share, basic (Non-GAAP)$0.56  $0.33  $0.42  $1.50  $1.06 
          
Shares used in basic per share calculation GAAP and Non-GAAP126,980  126,109  122,630  125,561  116,713 
          
Net income per share, diluted (GAAP)$0.50  $0.28  $0.88  $0.95  $1.23 
Stock-based compensation0.07  0.11  0.05  0.31  0.15 
Tariff refunds(0.12) (0.17)   (0.28)  
Restructuring and asset impairment charges    0.01    0.02 
Acquisition related expenses and amortization0.01      0.02  0.02 
Non-recurring debt prepayment fees and non-cash interest0.04  0.04  0.01  0.14  0.10 
Loss on partial settlement of Notes due 20240.02      0.02   
Change in fair value of derivatives      0.33  $ 
Non-GAAP income tax adjustment(0.01) 0.04  (0.56) (0.12) (0.57)
Net income (loss) per share, diluted (Non-GAAP)$0.51  $0.30  $0.39  $1.37  $0.95 
          
Shares used in diluted per share calculation GAAP145,990  141,820  132,872  141,918  131,644 
Shares used in per share calculation Non-GAAP139,527  137,352  132,233  137,469  131,193 
          
Net cash provided by operating activities (GAAP)$84,180  $67,501  $102,271  $216,334  $139,067 
Purchases of property and equipment(8,851) (3,903) (7,420) (20,558) (14,788)
Deemed repayment of convertible notes due 2024 attributable to accreted debt discount3,132      3,132   
Free cash flow (Non-GAAP)$78,461  $63,598  $94,851  $198,908  $124,279 

(2)  Calculation of non-GAAP diluted net income per share for the three months ended December 31, 2020, September 30, 2020 and December 31, 2019 excludes convertible notes due 2023 interest expense, net of tax of less than $0.1 million in each period from non-GAAP net income. Calculation of non-GAAP diluted net income per share for the year ended December 31, 2020 and December 31, 2019 excludes convertible notes due 2023 interest expense, net of tax of $0.1 million and $0.9 million, respectively, from non-GAAP net income.

(3)  Effect of dilutive in-the-money portion of convertible senior notes and warrants are included in the GAAP weighted-average diluted shares in periods where the Company has GAAP net income. The Company excluded the in-the-money portion of convertible notes due 2024 totaling 5,063 thousand shares, 4,468 thousand shares and 639 thousand shares in the three months ended December 31, 2020, September 30, 2020 and December 31, 2019, respectively, and 4,449 thousands and 451 thousand shares for the twelve months ended December 31, 2020 and December 31, 2019, respectively from non-GAAP weighted-average diluted shares as the Company entered into convertible note hedge transactions that reduce potential dilution to the Company’s common stock upon any conversion of the notes due 2024. The Company excluded the in-the-money portion of convertible notes due 2025 totaling 1,401 thousand shares in the three months ended December 31, 2020 from non-GAAP weighted-average diluted shares as the Company entered into convertible note hedge transactions that reduce potential dilution to the Company’s common stock upon any conversion of the notes due 2025.