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Consolidated Statements of 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 $ 0 $ 0 $ 0 $ 238 $ 238          
Balance at Dec. 31, 2018           $ 1,101 $ 780,400 $ (297) $ (731,969) $ 49,235
Net loss           0 0 0 (31,054) (31,054)
Other comprehensive income (loss)           0 0 208 0 208
Employee stock purchase plan sales           0 220 0 0 220
Stock-based compensation expense           0 3,317 0 0 3,317
Exercise of stock options, net           2 341 0 0 343
Balance at Mar. 31, 2019           1,103 784,278 (89) (762,785) 22,507
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018 $ 0 $ 0 $ 0 $ 238 $ 238          
Balance at Dec. 31, 2018           1,101 780,400 (297) (731,969) 49,235
Net loss                   (106,275)
Balance at Sep. 30, 2019           1,104 795,589 60 (838,006) (41,253)
Balance at Mar. 31, 2019           1,103 784,278 (89) (762,785) 22,507
Net loss           0 0 0 (37,629) (37,629)
Other comprehensive income (loss)           0 0 130 0 130
Stock-based compensation expense           0 5,385 0 0 5,385
Exercise of stock options, net           1 413 0 0 414
Balance at Jun. 30, 2019           1,104 790,076 41 (800,414) (9,193)
Net loss           0 0 0 (37,592) (37,592)
Other comprehensive income (loss)           0 0 19 0 19
Employee stock purchase plan sales           0 184 0 0 184
Stock-based compensation expense           0 5,329 0 0 5,329
Balance at Sep. 30, 2019           1,104 795,589 60 (838,006) (41,253)
Balance at Dec. 31, 2019           1,541 877,300 39 (840,628) 38,252
Net loss           0 0 0 (37,599) (37,599)
Other comprehensive income (loss)           0 0 (25) 0 (25)
Employee stock purchase plan sales           1 265 0 0 266
Stock-based compensation expense           0 2,754 0 0 2,754
Balance at Mar. 31, 2020           1,542 880,319 14 (878,227) 3,648
Balance at Dec. 31, 2019           1,541 877,300 39 (840,628) 38,252
Net loss                   (122,321)
Balance at Sep. 30, 2020           1,766 994,811 9 (962,949) 33,637
Balance at Mar. 31, 2020           1,542 880,319 14 (878,227) 3,648
Net loss           0 0 0 (38,607) (38,607)
Other comprehensive income (loss)           0 0 (11) 0 (11)
Stock-based compensation expense           0 3,280 0 0 3,280
Exercise of stock options, net           2 530 0 0 532
Issuance of common stock, net           220 92,628 0 0 92,848
Issuance of pre-funded warrants, 3,511 warrants           0 14,817 0 0 14,817
Balance at Jun. 30, 2020           1,764 991,574 3 (916,834) 76,507
Net loss           0 0 0 (46,115) (46,115)
Other comprehensive income (loss)           0 0 6 0 6
Employee stock purchase plan sales           2 364 0 0 366
Stock-based compensation expense           0 2,873 0 0 2,873
Balance at Sep. 30, 2020           $ 1,766 $ 994,811 $ 9 $ (962,949) $ 33,637