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Debt - Schedule of Maturities of Long Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
Jan. 11, 2021
Dec. 31, 2020
May 04, 2020
Long-term Debt, by Current and Noncurrent [Abstract]            
Unamortized debt discount $ (13,712)          
Unamortized debt issuance costs (759)          
Finance Obligations            
Less: Current portion of long-term debt (1,564)       $ (2,841)  
Equipment financing obligations 152       967  
Total Debt            
Remainder of 2021 716          
2022 930          
2023 69          
2024 1          
2025 201,250          
Thereafter 345,000          
Total Debt 547,966          
Less: Current portion of long-term debt (1,564)          
Total long-term debt, net 531,931       169,087  
0.25% Convertible Senior Notes due 2028 | Convertible Debt            
Line of Credit Facility [Line Items]            
Stated interest rate (as a percent)     0.25% 0.25%    
Long-term Debt, by Current and Noncurrent [Abstract]            
Remainder of 2021 0          
2022 0          
2023 0          
2024 0          
2025 0          
Thereafter 345,000          
Total Debt 345,000          
Less: Current portion of long-term debt 0          
Unamortized debt discount (9,326)       0  
Unamortized debt issuance costs (216)       0  
Long-term debt, net 335,458          
1.25% Convertible Senior Notes due 2025 | Convertible Debt            
Line of Credit Facility [Line Items]            
Stated interest rate (as a percent)   1.25% 1.25%     1.25%
Long-term Debt, by Current and Noncurrent [Abstract]            
Remainder of 2021 0          
2022 0          
2023 0          
2024 0          
2025 201,250          
Thereafter 0          
Total Debt 201,250          
Less: Current portion of long-term debt 0          
Unamortized debt discount (4,386)       (32,592)  
Unamortized debt issuance costs (543)       (538)  
Long-term debt, net 196,321          
Equipment Financing Obligations            
Long-term Debt, by Current and Noncurrent [Abstract]            
Unamortized debt discount 0          
Unamortized debt issuance costs 0          
Finance Obligations            
Remainder of 2021 716          
2022 930          
2023 69          
2024 1          
2025 0          
Thereafter 0          
Total Debt 1,716          
Less: Current portion of long-term debt (1,564)       $ (2,841)  
Equipment financing obligations $ 152