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Consolidated Statements Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2017 $ 984 $ 714,869 $ (243) $ (631,843) $ 83,767
Impact to retained earnings from adoption of new standard at Dec. 31, 2017 1,126 1,126
Net loss (25,777) (25,777)
Other comprehensive income (233) (233)
Exercise of stock options 2 79 81
Employee stock purchase plan sales 1 186 187
Stock-based compensation expense 2,903 2,903
Balance at Mar. 31, 2018 987 718,037 (476) (656,494) 62,054
Balance at Dec. 31, 2018 1,101 780,400 (297) (731,969) 49,235
Impact to retained earnings from adoption of new standard at Dec. 31, 2018 238 238
Net loss (31,054) (31,054)
Other comprehensive income 208 208
Exercise of stock options 2 341 343
Employee stock purchase plan sales 220 220
Stock-based compensation expense 3,317 3,317
Balance at Mar. 31, 2019 $ 1,103 $ 784,278 $ (89) $ (762,785) $ 22,507