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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | 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 deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (shares) at Dec. 31, 2016 |  |  |  | 20,909,301 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2016 | $ 341,290 |  |  | $ 21 | $ 769,653 |  |  | $ 2,743 | $ (431,127)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 253,364 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | (5,558) |  |  |  | (5,558) |  |  |  |
Reclassification of equity component of currently redeemable convertible notes | 10,704 |  |  |  | 10,704 |  |  |  |
Share-based compensation | $ 24,916 |  |  |  | 24,916 |  |  |  |
Repurchase of common stock (shares) | (14,000) |  |  | (14,000) |  |  |  |  |
Repurchase of common stock | $ (1,966) |  |  |  | (1,966) |  |  |  |
Other comprehensive income (loss) | (257) |  |  |  |  |  |  | (257) |
Foreign currency translation adjustment | 0 |  |  |  |  |  |  |  |
Net income (loss) | 12,556 |  |  |  |  |  |  |  | 12,556
Balance at end of period (shares) at Dec. 31, 2017 |  |  |  | 21,148,665 |  |  |  |  |
Balance at end of period at Dec. 31, 2017 | 399,788 |  |  | $ 21 | 798,205 |  |  | 2,486 | (400,924)
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)
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 |  |  | $ 17 | $ 367,326 |  |  | $ (216) | $ 400,105

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