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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | 2019 Convertible Senior Notes | 2023 Convertible Senior Notes | Common Stock | Additional paid-in capital | Additional paid-in capital 2019 Convertible Senior Notes | Additional paid-in capital 2023 Convertible Senior Notes | Accumulated other comprehensive income (loss) | Accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjustment | Accumulated deficit | Accumulated deficit Cumulative Effect, Period of Adoption, Adjustment
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Balance at beginning of period (shares) at Dec. 31, 2017 |  |  |  |  | 21,148,665 |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | $ 399,788 |  |  |  | $ 21 | $ 798,205 |  |  | $ 2,486 |  | $ (400,924) |
Balance at beginning of period (Accounting Standards Update 2016-01) at Dec. 31, 2017 |  | $ 0 |  |  |  |  |  |  |  | $ (2,662) |  | $ 2,662
Balance at beginning of period (Accounting Standards Update 2014-09) at Dec. 31, 2017 |  | 25,581 |  |  |  |  |  |  |  |  |  | 25,581
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  |  | 399,116 |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 16,417 |  |  |  |  | 16,417 |  |  |  |  |  |
Reclassification of equity component of currently redeemable convertible notes | 18,859 |  |  |  |  | 18,859 |  |  |  |  |  |
Share-based compensation | $ 20,846 |  |  |  |  | 20,846 |  |  |  |  |  |
Repurchase of common stock (shares) | (782,248) |  |  |  | (782,248) |  |  |  |  |  |  |
Repurchase of common stock | $ (127,481) |  |  |  |  | (127,481) |  |  |  |  |  |
Other comprehensive income (loss) | 73 |  |  |  |  |  |  |  | 73 |  |  |
Convertible bond hedge and warrant transactions, net of tax |  |  | $ (1,559) | $ (1,807) |  |  | $ (1,559) | $ (1,807) |  |  |  |
Loss on settlement of Notes |  |  | 3,187 |  |  |  | 3,187 |  |  |  |  |
Warrant repurchase |  |  | (30,472) |  |  |  | (30,472) |  |  |  |  |
Loss on repurchase of warrants |  |  | 1,792 |  |  |  | 1,792 |  |  |  |  |
Tax effect for Notes transactions |  |  | $ (1,680) | (3,181) |  |  | $ (1,680) | (3,181) |  |  |  |
Warrant derivative |  |  |  | $ 97,805 |  |  |  | $ 97,805 |  |  |  |
Foreign currency translation adjustment | (921) |  |  |  |  |  |  |  | (921) |  |  |
Other tax adjustments | 346 |  |  |  |  | 183 |  |  |  |  | 163 |
Net income (loss) | 143,321 |  |  |  |  |  |  |  |  |  | 143,321 |
Balance at end of period (shares) at Dec. 31, 2018 |  |  |  |  | 20,765,533 |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2018 | $ 560,914 |  |  |  | $ 21 | 791,114 |  |  | (1,024) |  | (229,197) |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  |  | 179,838 |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | $ (1,421) |  |  |  |  | (1,421) |  |  |  |  |  |
Share-based compensation | $ 24,515 |  |  |  |  | 24,515 |  |  |  |  |  |
Repurchase of common stock (shares) | (4,122,133) |  |  |  | (4,122,133) |  |  |  |  |  |  |
Repurchase of common stock | $ (448,433) |  |  |  | $ (4) | (448,429) |  |  |  |  |  |
Unrealized net gain on available-for-sale securities, net of deferred tax | 200 |  |  |  |  |  |  |  | 200 |  |  |
Foreign currency translation adjustment | 608 |  |  |  |  |  |  |  | 608 |  |  |
Other tax adjustments | 1,547 |  |  |  |  | 1,547 |  |  |  |  |  |
Net income (loss) | 629,302 |  |  |  |  |  |  |  |  |  | 629,302 |
Balance at end of period (shares) at Dec. 31, 2019 |  |  |  |  | 16,823,238 |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2019 | 767,232 | $ (5,168) |  |  | $ 17 | 367,326 |  |  | (216) |  | 400,105 | $ (5,168)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  |  | 190,672 |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 1,535 |  |  |  |  | 1,535 |  |  |  |  |  |
Share-based compensation | $ 30,727 |  |  |  |  | 30,727 |  |  |  |  |  |
Repurchase of common stock (shares) | (934,079) |  |  |  | (934,079) |  |  |  |  |  |  |
Repurchase of common stock | $ (77,998) |  |  |  | $ (1) | (77,997) |  |  |  |  |  |
Unrealized net gain on available-for-sale securities, net of deferred tax | (162) |  |  |  |  |  |  |  | (162) |  |  |
Foreign currency translation adjustment | (423) |  |  |  |  |  |  |  | (423) |  |  |
Reacquisition of equity due to 2023 debt extinguishment, net of tax | (3,236) |  |  |  |  | (3,236) |  |  |  |  |  |
Other tax adjustments | 3 |  |  |  |  | 3 |  |  |  |  |  |
Net income (loss) | (2,985) |  |  |  |  |  |  |  |  |  | (2,985) |
Balance at end of period (shares) at Dec. 31, 2020 |  |  |  |  | 16,079,831 |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2020 | $ 709,525 |  |  |  | $ 16 | $ 318,358 |  |  | $ (801) |  | $ 391,952 |

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