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Debt (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Feb. 16, 2018
shares
Feb. 15, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
day
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
shares
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 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                   $ (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         0   $ 0   40,624,000 0    
Proceeds from capped call confirmations, exchange of convertible debt               $ 19,900,000 $ 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         (3,192,000)       (3,192,000)   (74,145,000)  
Less: deferred financing         (373,000)       (373,000)   (4,115,000)  
Net carrying value of the debt         (149,260,000)       (149,260,000)   $ (321,740,000)  
Interest expense                        
Contractual interest expense         3,820,000   1,969,000   12,779,000 5,744,000    
Amortization of debt discount         182,000   2,609,000   2,164,000 7,620,000    
Amortization of deferred financing         23,000   137,000   145,000 399,000    
Total         $ 4,025,000   4,715,000   $ 15,088,000 13,763,000    
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       $ 150,000,000     $ 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%