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Consolidated Statements of Stockholders Equity (Deficit) - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 591 | $ 420,988 | $ 4 | $ (422,709) | $ (1,126)
Net loss |  |  |  | (45,189) | (45,189)
Other comprehensive income (loss) |  |  | (134) |  | (134)
Exercise of stock options | 13 | 4,984 |  |  | 4,997
Employee stock purchase plan sales | 1 | 309 |  |  | 310
Issuance of common stock | 115 | 106,485 |  |  | 106,600
Stock-based compensation expense |  | 10,177 |  |  | 10,177
Balance at Dec. 31, 2014 | 720 | 542,943 | (130) | (467,898) | 75,635
Net loss |  |  |  | (43,019) | (43,019)
Other comprehensive income (loss) |  |  | (76) |  | (76)
Exercise of stock options | 14 | 5,110 |  |  | 5,124
Employee stock purchase plan sales |  | 355 |  |  | 355
Stock-based compensation expense |  | 9,705 |  |  | 9,705
Balance at Dec. 31, 2015 | 734 | 558,113 | (206) | (510,917) | 47,724
Net loss |  |  |  | (55,144) | (55,144)
Other comprehensive income (loss) |  |  | 194 |  | 194
Exercise of stock options | 3 | (15) |  |  | (12)
Employee stock purchase plan sales | 1 | 328 |  |  | 329
Stock-based compensation expense |  | 8,487 |  |  | 8,487
Balance at Dec. 31, 2016 | $ 738 | $ 566,913 | $ (12) | $ (566,061) | $ 1,578

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