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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - 3 months ended Mar. 31, 2018 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Warrants
Additional Paid-In Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017 35,650 35,650 6,570    
Beginning balance at Dec. 31, 2017 $ 839,940 $ 36 $ 88,500 $ 1,038,324 $ (286,920)
Increase (Decrease) in Stockholders' Equity          
Issuance of stock awards, net of cancellations (in shares)   (90)      
Issuance of stock awards, net of cancellations 0 $ 0   0  
Stock-based compensation 16,055     16,055  
Cash paid for tax withholdings on vested stock awards (1,661)     (1,661)  
Net loss $ (40,894)       (40,894)
Ending balance (in shares) at Mar. 31, 2018 35,560 35,560 6,570    
Ending balance at Mar. 31, 2018 $ 813,440 $ 36 $ 88,500 $ 1,052,718 $ (327,814)