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Debt Instruments and Related Party Transactions - Convertible Debt (Details)
 12 Months Ended
Dec. 21, 2016
USD ($)
$ / shares
shares
Dec. 15, 2016
$ / item
Dec. 31, 2016
USD ($)
Convertible Debt      
Net proceeds from convertible notes to pay capped call transactions     $ 13,450,000
Equity component of the Convertible Notes     88,346,000
Deferred tax liability in relation to the Convertible Notes     29,845,000
Convertible notes issuance costs     2,709,000
Interest Expense, Debt [Abstract]      
Contractual interest expense     208,000
Amortization of deferred financing costs     26,000
Amortization of debt discount     248,000
Total interest expense     $ 482,000
Effective interest rate of the liability component     10.85%
Convertible Notes | 2016 Convertible Notes      
Convertible Debt      
Aggregate principle amount $ 250,000,000    
Net proceeds after deducting fees and estimated expenses 243,100,000    
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%    
Debt instrument term 7 years    
Equity component of the Convertible Notes $ 88,300,000    
Convertible notes issuance costs 7,500,000    
Convertible notes issuance cost paid $ 6,900,000    
Liability components of convertible notes      
Principle     $ 250,000,000
Less: debt discount     (90,807,000)
Less: deferred financing     (4,729,000)
Net carrying value of debt     154,464,000
Fair value of the debt     $ 258,800,000
Interest Expense, Debt [Abstract]      
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      
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