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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2017 $ 335,285 $ 12 $ 1,559,343 $ (1,223,671) $ (399)
Issuance of common stock from exercise of stock options     2,880    
Stock-based compensation     20,600    
Net loss (54,296)     (54,296)  
Other comprehensive income (loss)         (300)
Ending balance at Mar. 31, 2018 304,169 12 1,582,823 (1,277,967) (699)
Beginning balance at Dec. 31, 2018 479,079 14 1,948,300 (1,468,863) (372)
Issuance of common stock from exercise of stock options     4,176    
Stock-based compensation     19,826    
Net loss (85,304)     (85,304)  
Other comprehensive income (loss)         579
Ending balance at Mar. 31, 2019 $ 418,356 $ 14 $ 1,972,302 $ (1,554,167) $ 207