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Debt - Convertible Debt (Details)
1 Months Ended 3 Months Ended
Feb. 16, 2018
shares
Feb. 15, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
day
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Convertible Debt              
Derivative liability, noncurrent   $ 507,400,000          
Change in fair value of derivatives         $ 0 $ 4,861,000  
Derivative liabilities         80,600,000    
Capped call confirmation, current         2,200,000    
Exchange agreement, aggregate principal amount         $ 219,300,000    
Shares authorized for issuance (in shares) | shares         39,000,000    
Common stock, par value (in dollars per share) | $ / shares         $ 0.01   $ 0.01
Exchange agreement, accrued and unpaid interest         $ 1,000,000    
Loss on exchange of convertible debt         36,123,000 0  
Gain (loss) on extinguishment of debt, additional paid-in capital         (190,400,000)    
Gain (loss) on extinguishment of debt, fair value of common shares issued         (400,000)    
Proceeds from capped call confirmations, exchange of convertible debt         $ 14,632,000 0  
Common Stock Capped Call Confirmation              
Convertible Debt              
Derivative asset, noncurrent   $ 13,600,000          
Common Stock              
Convertible Debt              
Common stock issued from underwriting agreement (in shares) | shares 885,000 19,354,839          
Over-allotment Option | Common Stock              
Convertible Debt              
Number of days granted underwriters for purchase of shares   30 days          
Maximum number of additional shares granted to underwriters | shares 2,903,225            
Convertible Notes              
Convertible Debt              
Threshold percentage         130.00%    
Convertible Notes | Convertible Senior Notes 2016, Due 2023              
Convertible Debt              
Aggregate principal amount       $ 250,000,000      
Net proceeds after deducting fees and estimated expenses       243,000,000      
Proceeds for capped call confirmations       $ 13,500,000      
Shares issued per increment of convertible debt | shares       40,849,675      
Debt conversion ratio (in shares)       0.1633987      
Conversion price (in dollars per share) | $ / shares       $ 6.12      
Threshold consecutive trading days | day       30      
Debt Instruments [Abstract]              
Principal         $ 180,702,000   $ 400,000,000
Less: debt discount         (11,076,000)   (74,145,000)
Less: deferred financing         (808,000)   (4,115,000)
Net carrying value of the debt         (168,818,000)   $ (321,740,000)
Interest expense              
Contractual interest expense         4,813,000 1,887,000  
Amortization of debt discount         1,559,000 2,472,000  
Amortization of deferred financing         83,000 129,000  
Total         $ 6,455,000 $ 4,488,000  
Convertible Notes | Convertible Senior Notes 2016, Due 2023 | Minimum              
Convertible Debt              
Threshold trading days       20 days      
Convertible Notes | Convertible Senior Notes 2016, Due 2023 | Over-allotment Option | Private Placement Purchase Agreement              
Convertible Debt              
Aggregate principal amount       $ 25,000,000      
Line of Credit              
Debt Instruments              
New credit facility borrowing capacity     $ 150,000,000        
Debt instrument term     5 years        
Periodic payment, percentage     12.50%        
Proceeds from issuance of debt     $ 146,600,000        
Line of Credit | LIBOR              
Debt Instruments              
Basis spread on variable rate     7.50%