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Debt Instruments - Convertible Debt (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 21, 2016
USD ($)
$ / shares
shares
Dec. 15, 2016
$ / item
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Convertible Debt          
Debt instrument term         7 years
Equity component of the Convertible Notes         $ 88,300,000
Deferred tax liability in relation to the Convertible Notes         29,800,000
Convertible Notes | 2016 Convertible Notes          
Convertible Debt          
Aggregate principle amount $ 250,000,000        
Net proceeds after deducting fees and estimated expenses 243,000,000        
Net proceeds from convertible notes to pay capped call transactions $ 13,500,000        
Shares of common stock issued per increment of note principal | shares 40,849,675        
Debt conversion ratio (in shares) 0.1633987        
Increment used for debt conversion $ 1,000        
Conversion price (in dollars per share) | $ / shares $ 6.12        
Maximum calendar days allowed to holders of common stock rights options or warrants to purchase of common stock 60 days        
Trading days for price per share based on last reported sale price 10 days        
Minimum percentage of per share value of last reported sale price of common stock 10.00%        
Convertible notes issuance costs $ 7,500,000        
Convertible notes issuance cost paid $ 6,900,000        
Liability components of convertible notes          
Principal     $ 250,000,000 $ 250,000,000 250,000,000
Less: debt discount     (83,972,000) (83,972,000) (90,807,000)
Less: deferred financing     (4,393,000) (4,393,000) (4,729,000)
Net carrying value of the debt     161,635,000 161,635,000 $ 154,464,000
Fair value of the debt     644,000,000 644,000,000  
Interest expense          
Contractual interest expense     1,887,000 5,641,000  
Amortization of debt discount     2,342,000 6,835,000  
Amortization of deferred financing     122,000 344,000  
Total interest expense     $ 4,351,000 $ 12,820,000  
Effective interest rate of the liability component     10.85% 10.85%  
Initial cap price | $ / item   7.20      
Capped call premium on closing price   50.00%      
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 1          
Convertible Debt          
Threshold consecutive trading days 30 days        
Threshold percentage 130.00%        
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 1 | Minimum          
Convertible Debt          
Threshold trading days 20 days        
Convertible Notes | 2016 Convertible Notes | Convertible Notes, condition 2          
Convertible Debt          
Increment used for debt conversion $ 1,000        
Threshold trading days 5 days        
Threshold consecutive trading days 5 days        
Maximum threshold percentage 98.00%        
Over-allotment Option | Private Placement Purchase Agreement | Convertible Notes | 2016 Convertible Notes          
Convertible Debt          
Aggregate principle amount $ 25,000,000