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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)
--- | --- | --- | --- | --- | ---
Net income | $ 26,201 | $ 0 | $ 0 | $ 26,201 | $ 0
Foreign currency translation adjustment | 0 |  |  |  |
Balance at Dec. 31, 2013 | 340,229 | $ 113 | 1,128,148 | (787,727) | (305)
Balance (in shares) at Dec. 31, 2013 |  | 113,459 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | (97) | $ 0 | 0 | 0 | (97)
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | 10,559 | $ 2 | 10,557 | 0 | 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 1,703 |  |  |
Stock-based compensation | 14,730 | $ 0 | 14,730 | 0 | 0
Balance at Dec. 31, 2014 | 391,622 | $ 115 | 1,153,435 | (761,526) | (402)
Balance (in shares) at Dec. 31, 2014 |  | 115,162 |  |  |
Net income | 211,388 | $ 0 | 0 | 211,388 | 0
Foreign currency translation adjustment | 9 |  |  |  | 9
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Unrealized gain (loss) on marketable securities, net of tax | 766 | 0 | 0 | 0 | 766
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan | $ 13,077 | $ 2 | 13,075 | 0 | 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares) |  | 1,938 |  |  |
Stock Repurchased and Retired During Period, Shares | (7,812) | (7,812) |  |  |
Stock Repurchased and Retired During Period, Value | $ (80,000) | $ (8) | (45,926) | (54,179) | 0
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program | (100,113) |  |  |  |
Stock-based compensation | 15,096 | 0 | 15,096 | 0 | 0
Tax shortfall from stock option forfeitures | (5,312) |  | (5,312) |  |
Balance at Dec. 31, 2015 | 526,533 | $ 109 | 1,130,368 | (604,317) | 373
Balance (in shares) at Dec. 31, 2015 |  | 109,288 |  |  |
Net income | 6,820 | $ 0 | 0 | 6,820 | 0
Foreign currency translation adjustment | (13,485) |  |  |  | (13,485)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
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 |  |  |
Stock Repurchased and Retired During Period, Shares |  | (736) |  |  |
Stock Repurchased and Retired During Period, Value | (17,600) | $ (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 at Dec. 31, 2016 | $ 552,782 | $ 111 | $ 1,181,230 | $ (615,051) | $ (13,508)
Balance (in shares) at Dec. 31, 2016 |  | 111,054 |  |  |

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