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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, 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
Issuance of common stock, net 239 133,761 134,000
Stock-based compensation expense 12,621 12,621
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
Issuance of common stock, net 105 53,295 53,400
Stock-based compensation expense 9,396 9,396
Impact to retained earnings from adoption of new standard at Dec. 31, 2017 1,126 1,126
Balance at Dec. 31, 2018 1,101 780,400 (297) (731,969) 49,235
Net loss (108,897) (108,897)
Other comprehensive income (loss) 336 336
Exercise of stock options 3 832 835
Employee stock purchase plan sales 1 403 404
Issuance of common stock, net 436 58,064 58,500
Stock-based compensation expense 17,719 17,719
Impact to retained earnings from adoption of new standard at Dec. 31, 2018 238 238
Issuance of pre-funded warrants, 11,765 warrants 19,882 19,882
Balance at Dec. 31, 2019 $ 1,541 $ 877,300 $ 39 $ (840,628) $ 38,252