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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 income (loss)         1,262   1,262
Other comprehensive income (loss)     25       25
Issuance of common stock in conjunction with equity plans $ 1 198         199
Issuance of common stock in conjunction with equity plans, shares 834            
Stock-based compensation expense   4,032         4,032
Balance at Mar. 31, 2020 $ 154 1,125,229 30   (1,065,010)   60,403
Balance, shares at Mar. 31, 2020 153,953            
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 income (loss)         (87,435)   $ (87,435)
Other comprehensive income (loss)     (11)       (11)
Issuance of common stock in conjunction with equity plans $ 6 22,337         22,343
Issuance of common stock in conjunction with equity plans, shares 6,046            
Stock-based compensation expense   10,165         10,165
Balance at Mar. 31, 2021 $ 198 $ 1,404,585 $ 74   $ (1,124,304)   $ 280,553
Balance, shares at Mar. 31, 2021 198,340           198,340