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Debt - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 16, 2018
shares
Feb. 15, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
Feb. 28, 2018
shares
Jul. 31, 2017
shares
Dec. 31, 2016
USD ($)
day
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
day
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Jun. 30, 2018
$ / shares
shares
Jun. 07, 2018
USD ($)
shares
Convertible Debt                          
Common stock issued from underwriting agreement (in shares) | shares         21,100,000   18,700,000            
Fair value of derivative liability   $ 507,400,000                     $ 88,300,000
Fair value of derivative asset   $ 13,600,000                      
Change in fair value of derivatives                   $ (2,700,000)      
Common stock, shares authorized (in shares) | shares                 500,000,000 500,000,000 250,000,000 500,000,000 500,000,000
Exchange agreement, aggregate principal amount             $ 247,200,000 $ 247,200,000 $ 247,200,000        
Exchange agreement, authorized (in shares) | shares             44,000,000.0 44,000,000.0 44,000,000.0        
Common stock, par value (in dollars per share) | $ / shares             $ 0.01 $ 0.01 $ 0.01 $ 0.01   $ 0.01  
Accrued and unpaid interest on exchange agreement               $ 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        
Loss on exchange of convertible debt                 40,624,000 $ 0 $ 0    
Proceeds from capped call confirmations, exchange of convertible debt               $ 19,900,000 $ (19,875,000) $ 0 $ 0    
Common Stock Capped Call Confirmation                          
Convertible Debt                          
Capped call confirmations, initial cap price (in dollars per share) | $ / shares                 $ 7.20        
Capped call confirmations, premium percentage                 50.00%        
Common Stock                          
Convertible Debt                          
Common stock issued from underwriting agreement (in shares) | shares 885,000 19,400,000   20,200,000                  
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 | Common Stock Capped Call Confirmation                          
Convertible Debt                          
Fair value of derivative asset                         $ 2,400,000
Convertible Notes | 2016 Convertible Notes                          
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 consecutive trading days | day           30     30        
Threshold percentage           130.00%     130.00%        
Period following 5 consecutive trading day period, trading price less than 98% of product of sales price           5 days              
Period following issuance of stock rights options or warrants with price per share less than last reported sales price           60 days              
Period for measurement of sales price           10 days              
Excess of value per share for triggering event, percent           10.00%              
Convertible Notes | 2016 Convertible Notes | Minimum                          
Convertible Debt                          
Threshold trading days           20 days     20 days        
Convertible Notes | 2016 Convertible Notes | 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%