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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