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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Accumulated Deficit [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Total
Balance (Accounting Standards Update, Topic 326 [Member]) at Dec. 31, 2019       $ (32)   $ (32)  
Balance at Dec. 31, 2019 $ 153 $ 1,120,999 $ 5   $ (1,066,240)   $ 54,917
Balance, shares at Dec. 31, 2019 153,119            
Net loss         (21,824)   (21,824)
Other comprehensive income (loss)     238       238
Issuance of common stock in conjunction with equity plans $ 1 826         827
Issuance of common stock in conjunction with equity plans, shares 1,199            
Stock-based compensation expense   7,266         7,266
Balance at Jun. 30, 2020 $ 154 1,129,091 243   (1,088,096)   41,392
Balance, shares at Jun. 30, 2020 154,318            
Balance at Mar. 31, 2020 $ 154 1,125,229 30   (1,065,010)   60,403
Balance, shares at Mar. 31, 2020 153,953            
Net loss         (23,086)   (23,086)
Other comprehensive income (loss)     213       213
Issuance of common stock in conjunction with equity plans   628         628
Issuance of common stock in conjunction with equity plans, shares 365            
Stock-based compensation expense   3,234         3,234
Balance at Jun. 30, 2020 $ 154 1,129,091 243   (1,088,096)   41,392
Balance, shares at Jun. 30, 2020 154,318            
Balance at Dec. 31, 2020 $ 192 1,372,083 85   (1,036,869)   $ 335,491
Balance, shares at Dec. 31, 2020 192,294           192,294
Net loss         (128,436)   $ (128,436)
Other comprehensive income (loss)     (91)       (91)
Issuance of common stock in conjunction with equity plans $ 7 25,304         25,311
Issuance of common stock in conjunction with equity plans, shares 6,623            
Stock-based compensation expense   25,970         25,970
Balance at Jun. 30, 2021 $ 199 1,423,357 (6)   (1,165,305)   $ 258,245
Balance, shares at Jun. 30, 2021 198,917           198,917
Balance at Mar. 31, 2021 $ 198 1,404,585 74   (1,124,304)   $ 280,553
Balance, shares at Mar. 31, 2021 198,340            
Net loss         (41,001)   (41,001)
Other comprehensive income (loss)     (80)       (80)
Issuance of common stock in conjunction with equity plans $ 1 2,967         2,968
Issuance of common stock in conjunction with equity plans, shares 577            
Stock-based compensation expense   15,805         15,805
Balance at Jun. 30, 2021 $ 199 $ 1,423,357 $ (6)   $ (1,165,305)   $ 258,245
Balance, shares at Jun. 30, 2021 198,917           198,917