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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-In Capital | Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment | Accumulated deficit | Accumulated deficit Cumulative Effect, Period of Adoption, Adjustment | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Dec. 31, 2018 |  |  | 107,035 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2018 | $ 7,776 | $ 0 | $ 1 | $ 353,335 | $ 27 | $ (346,302) | $ (27) | $ 742
Issuance of common stock from exercise of equity awards and employee stock purchase plan (in shares) |  |  | 5,273 |  |  |  |  |
Issuance of common stock from exercise of equity awards and employee stock purchase plan | 4,985 |  |  | 4,985 |  |  |  |
Payment of withholding taxes related to net share settlement of equity awards | (8,198) |  |  | (8,198) |  |  |  |
Conversion of convertible notes due 2023, net (in shares) |  |  | 10,801 |  |  |  |  |
Settlement of convertible senior notes | 58,857 |  |  | 58,857 |  |  |  |
Cost of convertible notes hedge related to the convertible senior notes, net | (36,313) |  |  | (36,313) |  |  |  |
Sale of warrants related to the convertible senior notes | 29,818 |  |  | 29,818 |  |  |  |
Equity component of settlement of convertible senior notes, net | 35,387 |  |  | 35,387 |  |  |  |
Stock-based compensation | 20,417 |  |  | 20,417 |  |  |  |
Net income | 161,148 |  |  |  |  | 161,148 |  |
Foreign currency translation adjustments | (1,665) |  |  |  |  |  |  | (1,665)
Change in net unrealized loss on marketable securities, net of tax | 0 |  |  |  |  |  |  |
Balance, ending of period (in shares) at Dec. 31, 2019 |  |  | 123,109 |  |  |  |  |
Balance, end of period at Dec. 31, 2019 | 272,212 |  | $ 1 | 458,315 |  | (185,181) |  | (923)
Issuance of common stock from exercise of equity awards and employee stock purchase plan (in shares) |  |  | 4,002 |  |  |  |  |
Issuance of common stock from exercise of equity awards and employee stock purchase plan | 8,395 |  |  | 8,395 |  |  |  |
Payment of withholding taxes related to net share settlement of equity awards | (68,330) |  |  | (68,330) |  |  |  |
Conversion of convertible notes due 2023, net (in shares) |  |  | 1,851 |  |  |  |  |
Settlement of convertible senior notes | 301,015 |  |  | 301,015 |  |  |  |
Equity component of convertible senior notes, net | 116,502 |  |  | 116,502 |  |  |  |
Cost of convertible notes hedge related to the convertible senior notes, net | (117,108) |  |  | (117,108) |  |  |  |
Sale of warrants related to the convertible senior notes | 96,351 |  |  | 96,351 |  |  |  |
Equity component of settlement of convertible senior notes, net | (306,220) |  |  | (306,220) |  |  |  |
Exercise of convertible notes hedge related to the convertible senior notes (in shares) |  |  | (1,851) |  |  |  |  |
Exercise of warrants related to convertible senior notes (in shares) |  |  | 1,851 |  |  |  |  |
Change in fair value of common stock related to acquisition | 3,321 |  |  | 3,321 |  |  |  |
Stock-based compensation | 42,503 |  |  | 42,503 |  |  |  |
Net income | 133,995 |  |  |  |  | 133,995 |  |
Foreign currency translation adjustments | 1,357 |  |  |  |  |  |  | 1,357
Change in net unrealized loss on marketable securities, net of tax | $ 0 |  |  |  |  |  |  |
Balance, ending of period (in shares) at Dec. 31, 2020 | 128,962 |  | 128,962 |  |  |  |  |
Balance, end of period at Dec. 31, 2020 | $ 483,993 |  | $ 1 | 534,744 |  | (51,186) |  | 434
Issuance of common stock from exercise of equity awards and employee stock purchase plan (in shares) |  |  | 2,808 |  |  |  |  |
Issuance of common stock from exercise of equity awards and employee stock purchase plan | 7,484 |  |  | 7,484 |  |  |  |
Payment of withholding taxes related to net share settlement of equity awards (in shares) |  |  | 0 |  |  |  |  |
Payment of withholding taxes related to net share settlement of equity awards | (29,136) |  |  | (29,136) |  |  |  |
Equity component of convertible senior notes, net | 207,970 |  |  | 207,970 |  |  |  |
Cost of convertible notes hedge related to the convertible senior notes, net | (213,322) |  |  | (213,322) |  |  |  |
Sale of warrants related to the convertible senior notes | 220,800 |  |  | 220,800 |  |  |  |
Equity component of settlement of convertible senior notes, net | (976,714) |  |  | (976,714) |  |  |  |
Settlement of convertible senior notes (in shares) |  |  | 5,489 |  |  |  |  |
Settlement of convertible senior notes | 972,273 |  |  | 972,273 |  |  |  |
Exercise of convertible notes hedge related to the convertible senior notes (in shares) |  |  | (5,721) |  |  |  |  |
Exercise of warrants related to convertible senior notes (in shares) |  |  | 5,582 |  |  |  |  |
Stock-based compensation | 113,825 |  |  | 113,825 |  |  |  |
Net income | 145,449 |  |  |  |  | 145,449 |  |
Repurchase of common stock (in shares) |  |  | (3,226) |  |  |  |  |
Repurchase of common stock | (500,000) |  |  |  |  | (500,000) |  |
Foreign currency translation adjustments | (334) |  |  |  |  |  |  | (334)
Change in net unrealized loss on marketable securities, net of tax | $ (2,120) |  |  |  |  |  |  | (2,120)
Balance, ending of period (in shares) at Dec. 31, 2021 | 133,894 |  | 133,894 |  |  |  |  |
Balance, end of period at Dec. 31, 2021 | $ 430,168 |  | $ 1 | $ 837,924 |  | $ (405,737) |  | $ (2,020)

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