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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2015 $ 311,698 $ 618 $ 900,043 $ (588,963) $ 0
Balance (in shares) at Dec. 31, 2015   61,814,000      
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]          
Net loss (176,273)     (176,273)  
Other comprehensive income (loss) (65)       (65)
Exercise of stock options $ 1,084 $ 2 1,082    
Exercise of stock options (in shares) 162,340 162,000      
Issuance of common stock for vesting of RSUs $ 0        
Issuance of common stock for vesting of RSUs (in shares)   44,000      
Stock compensation expense 18,039   18,039    
Balance at Dec. 31, 2016 154,483 $ 620 919,164 (765,236) (65)
Balance (in shares) at Dec. 31, 2016   62,020,000      
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]          
Net loss (192,649)     (192,649)  
Other comprehensive income (loss) 62       62
Exercise of stock options $ 3,433 $ 4 3,429    
Exercise of stock options (in shares) 378,275 379,000      
Net proceeds from issuance of common stock $ 377,656 $ 141 377,515    
Net proceeds from issuance of common stock (in shares)   14,123,000      
Issuance of common stock for vesting of RSUs 1 $ 1      
Issuance of common stock for vesting of RSUs (in shares)   89,000      
Stock compensation expense 18,073   18,073    
Balance at Dec. 31, 2017 361,059 $ 766 1,318,181 (957,885) (3)
Balance (in shares) at Dec. 31, 2017   76,611,000      
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]          
Net loss (324,277)     (324,277)  
Other comprehensive income (loss) (6)       (6)
Exercise of stock options $ 8,815 $ 6 8,809    
Exercise of stock options (in shares) 494,351 645,000      
Equity component of convertible debt issuance $ 136,434   136,434    
Issuance of common stock for vesting of RSUs 1 $ 1      
Issuance of common stock for vesting of RSUs (in shares)   52,000      
Stock compensation expense 26,240   26,240    
Balance at Dec. 31, 2018 $ 208,266 $ 773 $ 1,489,664 $ (1,282,162) $ (9)
Balance (in shares) at Dec. 31, 2018   77,308,000