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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 2014-09 [Member]) at Dec. 31, 2017       $ 189   $ 189  
Balance at Dec. 31, 2017 $ 116 $ 965,752 $ (32)   $ (879,733)   $ 86,103
Balance, shares at Dec. 31, 2017 116,277            
Net income (loss)         (102,562)   (102,562)
Other comprehensive income (loss)     (4)       (4)
Issuance of common stock in conjunction with equity plans $ 4 9,648         9,652
Issuance of common stock in conjunction with equity plans, shares 3,357            
Issuance of common stock from Underwritten Public Equity Offerings, net of issuance costs $ 30 97,500         97,530
Issuance of common stock from Underwritten Public Equity Offerings, net of issuance costs, shares 30,610            
Stock-based compensation expense   23,153         23,153
Balance at Dec. 31, 2018 $ 150 1,096,053 (36)   (982,106)   114,061
Balance, shares at Dec. 31, 2018 150,244            
Net income (loss)         (84,134)   (84,134)
Other comprehensive income (loss)     41       41
Issuance of common stock in conjunction with equity plans $ 3 8,545         8,548
Issuance of common stock in conjunction with equity plans, shares 2,875            
Stock-based compensation expense   16,401         16,401
Balance (Accounting Standards Update 2019-04 [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           153,119
Net income (loss)         29,403   $ 29,403
Other comprehensive income (loss)     80       80
Issuance of common stock in conjunction with equity plans $ 10 46,350         46,360
Issuance of common stock in conjunction with equity plans, shares 9,819            
Issuance of common stock from Underwritten Public Equity Offerings, net of issuance costs $ 29 187,201         187,230
Issuance of common stock from Underwritten Public Equity Offerings, net of issuance costs, shares 29,356            
Stock-based compensation expense   17,533         17,533
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