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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
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 at Dec. 31, 2018 $ 150 $ 1,096,053 $ (36)   $ (982,106)   $ 114,061
Balance, shares at Dec. 31, 2018 150,244            
Net loss         (54,920)   (54,920)
Other comprehensive income     53       53
Issuance of common stock in conjunction with equity plans $ 3 8,087         8,090
Issuance of common stock in conjunction with equity plans, shares 2,715            
Stock-based compensation expense   8,470         8,470
Balance at Jun. 30, 2019 $ 153 1,112,610 17   (1,037,026)   75,754
Balance, shares at Jun. 30, 2019 152,959            
Balance at Mar. 31, 2019 $ 153 1,107,121 6   (1,012,430)   94,850
Balance, shares at Mar. 31, 2019 152,672            
Net loss         (24,596)   (24,596)
Other comprehensive income     11       11
Issuance of common stock in conjunction with equity plans   1,400         1,400
Issuance of common stock in conjunction with equity plans, shares 287            
Stock-based compensation expense   4,089         4,089
Balance at Jun. 30, 2019 $ 153 1,112,610 17   (1,037,026)   75,754
Balance, shares at Jun. 30, 2019 152,959            
Balance at Dec. 31, 2019 $ 153 1,120,999 5 $ (32) (1,066,240) $ (32) $ 54,917
Balance, shares at Dec. 31, 2019 153,119           153,119
Net loss         (21,824)   $ (21,824)
Other comprehensive income     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           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     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           154,318