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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Gain (Loss)
--- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  | 109,764 |  |  |
Balance at Dec. 31, 2017 | $ 571,584 | $ 110 | $ 1,212,798 | $ (636,227) | $ (5,097)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | (35,689) | 0 | 0 | (35,689) | 0
Foreign currency translation adjustment | 2,889 |  |  |  | 2,889
Unrealized gain (loss) on marketable securities, net of tax | (804) | 0 | 0 | 0 | (804)
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | (3,842) | $ 0 | (3,842) | 0 | 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 839 |  |  |
Stock Repurchased and Retired During Period, Shares |  | (3,118) |  |  |
Stock Repurchased and Retired During Period, Value |  | $ (3) | (20,312) | (29,685) | 0
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program | (50,000) |  |  |  |
Stock-based compensation | 7,514 | $ 0 | 7,514 | 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 |
Balance (in shares) at Mar. 31, 2018 |  | 107,485 |  |  |
Balance at Mar. 31, 2018 | 1,118,998 | $ 107 | 1,196,158 | (74,255) | (3,012)
Balance (in shares) at Dec. 31, 2018 |  | 109,018 |  |  |
Balance at Dec. 31, 2018 | 1,012,112 | $ 109 | 1,226,588 | (204,294) | (10,291)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | (26,576) | 0 | 0 | (26,576) | 0
Foreign currency translation adjustment | 1,575 |  |  |  | 1,575
Unrealized gain (loss) on marketable securities, net of tax | 48 | 0 | 0 | 0 | 48
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 1,070 | $ 1 | 1,069 | 0 | 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 1,378 |  |  |
Stock-based compensation | 7,189 | $ 0 | 7,189 | 0 | 0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | Accounting Standards Update 2016-02 [Member] | 4,469 |  |  | 4,469 |
Balance (in shares) at Mar. 31, 2019 |  | 110,396 |  |  |
Balance at Mar. 31, 2019 | $ 999,887 | $ 110 | $ 1,234,846 | $ (226,401) | $ (8,668)

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