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Consolidated Statements Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
AOCI Attributable to Parent [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018 $ 238 $ 238          
Balance at Dec. 31, 2018           $ 1,101 $ 780,400 $ (297) $ (731,969) $ 49,235
Net loss           (31,054) (31,054)
Other comprehensive loss           208 208
Employee stock purchase plan sales           220 220
Stock-based compensation expense           3,317 3,317
Exercise of stock options           2 341 343
Balance at Mar. 31, 2019           1,103 784,278 (89) (762,785) 22,507
Balance at Dec. 31, 2019           1,541 877,300 39 (840,628) 38,252
Net loss           (37,599) (37,599)
Other comprehensive loss           (25) (25)
Employee stock purchase plan sales           1 265 266
Stock-based compensation expense           2,754 2,754
Balance at Mar. 31, 2020           $ 1,542 $ 880,319 $ 14 $ (878,227) $ 3,648