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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 Senior Notes due 2018 | 1.125% Convertible Senior Notes due 2018 Additional Paid-in Capital | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] Additional Paid-in Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2015 |  | 109,288,000 |  |  |  |  |  |  |
Balance at Dec. 31, 2015 | $ 526,533 | $ 109 | $ 1,130,368 | $ (604,317) | $ 373 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) | 6,820 | 0 | 0 | 6,820 | 0 |  |  |  |
Foreign currency translation adjustment | (13,485) |  |  |  | (13,485) |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | (396) | 0 | 0 | 0 | (396) |  |  |  |
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 12,297 | $ 3 | 12,294 | 0 | 0 |  |  |  |
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 2,502,000 |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | (736,000) |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ (1) | 17,555 | (17,554) | 0 |  |  |  |
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program | 0 |  |  |  |  |  |  |  |
Stock-based compensation | 21,013 | $ 0 | 21,013 | 0 | 0 |  |  |  |
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 | (37,456) | $ (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 | Equity Securities [Member] | 1,058 |  |  | 1,058 |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | Accounting Standards Update 2014-09 [Member] | 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) |  |  |  |

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