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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, 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
Net loss       (101,252) (101,252)
Other comprehensive income (loss) (54) (54)
Exercise of stock options 11 2,490 2,501
Employee stock purchase plan sales 1 350     351
Stock-based compensation expense   9,396     9,396
Issuance of common stock 105 53,295 53,400
Impact to retained earnings from adoption of ASC 606 at Dec. 31, 2017 1,126 1,126
Balance at Dec. 31, 2018 $ 1,101 $ 780,400 $ (297) $ (731,969) $ 49,235