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Debt - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2020
USD ($)
day
Dec. 31, 2016
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Convertible Debt                  
Loss on extinguishment of debt           $ (257,000) $ (7,276,000) $ 0  
Proceeds from long-term debt, net of issuance costs           $ 0 $ 385,929,000 0  
Common stock, par value (in dollars per share) | $ / shares           $ 0.01 $ 0.01    
Equity component of the convertible notes           $ 2,661,000   215,476,000  
Loss on exchange of convertible notes           0 $ 0 40,624,000  
Proceeds from termination of capped call confirmations           $ 0 $ 0 $ 19,875,000  
Additional Paid-In Capital                  
Convertible Debt                  
Equity component of the convertible notes     $ 2,656,000 $ 215,036,000          
Common Stock                  
Convertible Debt                  
Equity component of the convertible notes     $ 5,000 $ 440,000          
Equity component of the convertible notes (in shares) | shares     472,356 44,000,000       43,995,139  
Convertible Notes                  
Convertible Debt                  
Exchange agreement, aggregate principal amount         $ 247,200,000        
Exchange agreement, authorized (in shares) | shares         44,000,000        
Common stock, par value (in dollars per share) | $ / shares         $ 0.01        
Accrued and unpaid interest on exchange agreement         $ 1,300,000        
Gain (loss) on extinguishment of debt, fair value of common shares issued               $ 400,000  
Loss on exchange of convertible notes               40,600,000  
Proceeds from termination of capped call confirmations         $ 19,900,000        
Convertible Notes | Additional Paid-In Capital                  
Convertible Debt                  
Equity component of the convertible notes               $ 215,000,000  
Convertible Notes | 2016 Convertible Notes                  
Convertible Debt                  
Aggregate principal amount   $ 250,000,000              
Proceeds from long-term debt, net of issuance costs   243,000,000              
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              
Debt conversion, converted instrument, amount     $ 2,800,000 $ 247,200,000          
Convertible Notes | 2016 Convertible Notes | Private Placement Purchase Agreement | Over-allotment Option                  
Convertible Debt                  
Aggregate principal amount   $ 25,000,000              
Secured Debt | Senior Secured Term Loan due 2026:                  
Convertible Debt                  
Interest expense, debt $ 1,100,000                
Early settlement premiums 5,200,000                
Loss on extinguishment of debt (7,300,000)                
Secured Debt | Senior Loans                  
Convertible Debt                  
Maximum borrowing capacity $ 400,000,000                
Number of payments | day 9                
Periodic payment $ 44,400,000                
Proceeds from secured lines of credit 385,900,000                
Minimum liquidity covenant 75,000,000                
Secured Debt | Senior Loans | Minimum                  
Convertible Debt                  
Consolidated revenue covenant, amount 140,000,000                
Secured Debt | Senior Loans | Maximum                  
Convertible Debt                  
Consolidated revenue covenant, amount $ 225,000,000                
Secured Debt | Senior Loans | LIBOR                  
Convertible Debt                  
Variable rate 1.00%                
Basis spread on variable rate 6.50%                
Line of Credit                  
Convertible Debt                  
Maximum borrowing capacity                 $ 150,000,000