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v3.3.1.900

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 509 | $ 391,611 | $ 27 | $ (392,601) | $ (454)
Net loss |  |  |  | (30,108) | (30,108)
Other comprehensive loss |  |  | (23) |  | (23)
Exercise of stock options | 6 | 1,327 |  |  | 1,333
Employee stock purchase plan sales | 1 | 123 |  |  | 124
Issuance of common stock | 75 | 23,559 |  |  | 23,634
Stock-based compensation expense |  | 4,368 |  |  | 4,368
Balance at Dec. 31, 2013 | 591 | 420,988 | 4 | (422,709) | (1,126)
Net loss |  |  |  | (45,189) | (45,189)
Other comprehensive 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 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

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