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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, 2017 $ 116 $ 965,752 $ (32) $ (879,733) $ 86,103
Balance, shares at Dec. 31, 2017 116,277        
Net loss       (24,179) (24,179)
Other comprehensive loss     (6)   (6)
ASC606 adoption effect       189 189
Issuance of common stock in conjunction with equity plans $ 2 2,485     2,487
Issuance of common stock in conjunction with equity plans, shares 1,220        
Issuance of common stock from ATM equity offering, net of issuance costs $ 14 32,848     32,862
Issuance of common stock from ATM equity offering, net of issuance costs, shares 14,375        
Stock-based compensation expense   5,282     5,282
Balance at Mar. 31, 2018 $ 132 1,006,367 (38) (903,723) 102,738
Balance, shares at Mar. 31, 2018 131,872        
Balance at Dec. 31, 2017 $ 116 965,752 (32) (879,733) 86,103
Balance, shares at Dec. 31, 2017 116,277        
Balance at Dec. 31, 2018 $ 150 1,096,053 (36) (982,106) $ 114,061
Balance, shares at Dec. 31, 2018 150,244       150,244
Net loss       (30,324) $ (30,324)
Other comprehensive loss     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       152,672