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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Loss [Member] | Retained Earnings (Accumulated Deficit) [Member]
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2013 | $ 455,384 | $ 819 | $ (214,494) | $ 600,904 | $ (503) | $ 68,658
BALANCE, shares at Dec. 31, 2013 |  |  | (14,719,000) |  |  |
BALANCE, shares at Dec. 31, 2013 |  | 81,890,000 |  |  |  |
Net income (loss) | (178,163) |  |  |  |  | (178,163)
Unrealized gain (loss) on investments | (350) |  |  |  | (350) |
COMPREHENSIVE (LOSS) INCOME | (178,513) |  |  |  |  |
Share-based compensation expense: |  |  |  |  |  |
Stock option plan | 1,372 |  |  | 1,372 |  |
Restricted stock award plan | 2,865 |  |  | 2,865 |  |
Employee stock purchase plan | 40 |  |  | 40 |  |
Common stock issued under: |  |  |  |  |  |
Stock option plan | $ 612 | $ 2 |  | 610 |  |
Stock option plan, shares | 225,000 | 225,000 |  |  |  |
Restricted stock award plan | $ (671) | $ 1 | $ (671) | (1) |  |
Restricted stock award plan, shares |  | 95,000 | (97,000) |  |  |
Employee stock purchase plan | 742 | $ 1 |  | 741 |  |
Employee stock purchase plan, shares |  | 127,000 |  |  |  |
Cumulative adjustment for change from cost method investment to equity method investment | 102 |  |  |  |  | 102
BALANCE at Dec. 31, 2014 | 281,933 | $ 823 | $ (215,165) | 606,531 | (853) | (109,403)
BALANCE, shares at Dec. 31, 2014 |  |  | (14,816,000) |  |  |
BALANCE, shares at Dec. 31, 2014 |  | 82,337,000 |  |  |  |
Net income (loss) | 51,885 |  |  |  |  | 51,885
Unrealized gain (loss) on investments | (27) |  |  |  | (27) |
COMPREHENSIVE (LOSS) INCOME | 51,858 |  |  |  |  |
Share-based compensation expense: |  |  |  |  |  |
Stock option plan | 442 |  |  | 442 |  |
Restricted stock award plan | 2,385 |  |  | 2,385 |  |
Employee stock purchase plan | 30 |  |  | 30 |  |
Common stock issued under: |  |  |  |  |  |
Stock option plan | $ 828 | $ 3 |  | 825 |  |
Stock option plan, shares | 303,035 | 303,000 |  |  |  |
Restricted stock award plan | $ (439) | $ 2 | $ (441) |  |  |
Restricted stock award plan, shares |  | 214,000 | (82,000) |  |  |
Employee stock purchase plan | 573 | $ 2 |  | 571 |  |
Employee stock purchase plan, shares |  | 143,000 |  |  |  |
BALANCE at Dec. 31, 2015 | $ 337,610 | $ 830 | $ (215,606) | 610,784 | (880) | (57,518)
BALANCE, shares at Dec. 31, 2015 | (14,897,931) |  | (14,898,000) |  |  |
BALANCE, shares at Dec. 31, 2015 | 82,996,585 | 82,997,000 |  |  |  |
Net income (loss) | $ (18,712) |  |  |  |  | (18,712)
Foreign currency translation | (77) |  |  |  | (77) |
Unrealized gain (loss) on investments | 699 |  |  |  | 699 |
COMPREHENSIVE (LOSS) INCOME | (18,090) |  |  |  |  |
Share-based compensation expense: |  |  |  |  |  |
Stock option plan | 1,256 |  |  | 1,256 |  |
Restricted stock award plan | 1,960 |  |  | 1,960 |  |
Employee stock purchase plan | 21 |  |  | 21 |  |
Common stock issued under: |  |  |  |  |  |
Stock option plan | $ 375 | $ 1 |  | 374 |  |
Stock option plan, shares | 89,773 | 90,000 |  |  |  |
Restricted stock award plan | $ (563) | $ 3 | $ (563) | (3) |  |
Restricted stock award plan, shares |  | 387,000 | (121,000) |  |  |
Employee stock purchase plan | 398 | $ 1 |  | 397 |  |
Employee stock purchase plan, shares |  | 64,000 |  |  |  |
Tax benefit of stock settlements | (1,464) |  |  | (1,464) |  |
BALANCE at Dec. 31, 2016 | $ 321,503 | $ 835 | $ (216,169) | $ 613,325 | $ (258) | $ (76,230)
BALANCE, shares at Dec. 31, 2016 | (15,019,028) |  | (15,019,000) |  |  |
BALANCE, shares at Dec. 31, 2016 | 83,538,033 | 83,538,000 |  |  |  |

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