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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]
Total
Balance at Dec. 31, 2018 $ 150 $ 1,096,053 $ (36) $ (982,106) $ 114,061
Balance, shares at Dec. 31, 2018 150,244        
Net lincome (loss)       (30,324) (30,324)
Other comprehensive income     42   42
Issuance of common stock in conjunction with equity plans $ 3 6,687     6,690
Issuance of common stock in conjunction with equity plans, shares 2,428        
Stock-based compensation expense   4,381     4,381
Balance at Mar. 31, 2019 $ 153 1,107,121 6 (1,012,430) 94,850
Balance, shares at Mar. 31, 2019 152,672        
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 lincome (loss)       1,262 $ 1,262
Other comprehensive income     25   25
Adoption effect of Topic 326       (32) (32)
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       153,953