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Debt (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 16, 2018
shares
Feb. 15, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
day
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Jun. 07, 2018
USD ($)
shares
Convertible Debt                      
Common stock issued from underwriting agreement (in shares) | shares         18,700,000            
Derivative liability, noncurrent   $ 507,400,000                  
Change in fair value of derivatives             $ (7,600,000)   $ (2,700,000)    
Common stock, shares authorized (in shares) | shares         500,000,000     500,000,000   500,000,000 500,000,000
Derivative liabilities                     $ 88,300,000
Other assets, current                     $ 2,400,000
Exchange agreement, aggregate principal amount         $ 247,200,000     $ 247,200,000      
Shares authorized for issuance (in shares) | shares         44,000,000.0     44,000,000.0      
Common stock, par value (in dollars per share) | $ / shares         $ 0.01     $ 0.01   $ 0.01  
Exchange agreement, accrued and unpaid interest               $ 1,300,000      
Gain (loss) on extinguishment of debt, additional paid-in capital         $ 215,000,000.0            
Gain (loss) on extinguishment of debt, fair value of common shares issued         400,000            
Gain (loss) on exchange of convertible debt         (4,501,000) $ (36,100,000) 0 (40,624,000) 0    
Proceeds from capped call confirmations, exchange of convertible debt               $ 19,875,000 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 19,400,000                  
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 (in shares) | shares 2,900,000                    
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       243,000,000.0              
Proceeds for capped call confirmations       $ 13,500,000              
Shares issued per increment of convertible debt (in shares) | shares       40,800,000              
Debt conversion ratio (in shares)       0.1633987              
Conversion price (in dollars per share) | $ / shares       $ 6.12              
Threshold trading days       20 days              
Threshold consecutive trading days | day       30              
Debt Instruments [Abstract]                      
Principal         152,825,000     $ 152,825,000   $ 400,000,000  
Less: debt discount         (3,373,000)     (3,373,000)   (74,145,000)  
Less: deferred financing         (388,000)     (388,000)   (4,115,000)  
Net carrying value of the debt         (149,064,000)     (149,064,000)   $ (321,740,000)  
Interest expense                      
Contractual interest expense         4,146,000   1,888,000 8,959,000 3,775,000    
Amortization of debt discount         423,000   2,539,000 1,982,000 5,011,000    
Amortization of deferred financing         39,000   133,000 122,000 262,000    
Total         $ 4,608,000   $ 4,560,000 $ 11,063,000 $ 9,048,000    
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%