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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, 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
Net loss       (65,782) (65,782)
Other comprehensive income (loss)     (231)   (231)
Exercise of stock options 6 1,230 1,236
Employee stock purchase plan sales 1 344     345
Stock-based compensation expense   12,621     12,621
Issuance of common stock 239 133,761     134,000
Balance at Dec. 31, 2017 $ 984 $ 714,869 $ (243) $ (631,843) $ 83,767