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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Gain (Loss) | 1.125% convertible notes | 1.125% convertible notes Additional Paid-in Capital | 1.375% convertible notes | 1.375% convertible notes Additional Paid-in Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2016 |  | 111,054,000 |  |  |  |  |  |  |
Balance at Dec. 31, 2016 | $ 552,782 | $ 111 | $ 1,181,230 | $ (615,051) | $ (13,508) |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) | (22,862) | 0 | 0 | (22,862) | 0 |  |  |  |
Foreign currency translation adjustment | 7,798 |  |  |  | 7,798 |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | 613 | 0 | 0 | 0 | 613 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 10,733 | $ 3 | 10,730 | 0 | 0 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 2,727,000 |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | (4,017,000) |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ (4) | (13,477) | (36,557) | 0 |  |  |  |
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program | (50,038) |  |  |  |  |  |  |  |
Stock-based compensation | 27,403 | $ 0 | 27,403 | 0 | 0 |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt |  |  |  |  |  | $ (16,651) | $ (16,651) | $ 33,913 | $ 33,913
Adjustments to Additional Paid in Capital, Purchase of convertible note hedges | (33,523) |  |  |  |  |  |  |  | $ (33,523)
Adjustments to Additional Paid in Capital, Warrant Issued | 23,173 |  | 23,173 |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | 38,243 |  |  | 38,243 |  |  |  |  |
Balance (in shares) at Dec. 31, 2017 |  | 109,764,000 |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | 571,584 | $ 110 | 1,212,798 | (636,227) | (5,097) |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) | (157,957) | 0 | 0 | (157,957) | 0 |  |  |  |
Foreign currency translation adjustment | (4,447) |  |  |  | (4,447) |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | (747) | 0 | 0 | 0 | (747) |  |  |  |
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 4,630 | $ 3 | 4,627 | 0 | 0 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 2,616,000 |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | (3,786,000) |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | (37,500) | $ (4) | (12,573) | (37,456) | 0 |  |  |  |
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program | (50,033) |  |  |  |  |  |  |  |
Stock-based compensation | 21,736 | $ 0 | 21,736 | 0 | 0 |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | Accounting Standards Update 2016-01 | 1,058 |  |  | 1,058 |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | Accounting Standards Update 2014-09 | 626,288 |  |  | 626,288 |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  | 424,000 |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2018 |  | 109,018,000 |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | 1,012,112 | $ 109 | 1,226,588 | (204,294) | (10,291) |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) | (90,419) | 0 | 0 | (90,419) | 0 |  |  |  |
Foreign currency translation adjustment | 10,145 |  |  |  | 10,145 |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | 54 | 0 | 0 | 0 | 54 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 8,081 | $ 3 | 8,078 | 0 | 0 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 3,113,000 |  |  |  |  |  |  |
Stock-based compensation | 26,476 | $ 0 | 26,476 | 0 | 0 |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | Accounting Standards Update 2016-02 | 4,469 |  |  | 4,469 |  |  |  |  |
Balance (in shares) at Dec. 31, 2019 |  | 112,131,000 |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 970,918 | $ 112 | $ 1,261,142 | $ (290,244) | $ (92) |  |  |  |

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