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Debt - Schedule of Maturities of Long Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
May 04, 2020
Dec. 31, 2019
Long-term Debt, by Current and Noncurrent [Abstract]      
Less:  Current portion of long-term debt $ 0   $ (5,000)
Unamortized debt issuance costs (565)    
Finance Obligations      
Less:  Current portion of long-term debt (3,700)   (5,432)
Long-term debt, net 1,399   3,199
Total Debt      
Remainder of 2020 1,252    
2021 2,880    
2022 916    
2023 51    
2024 0    
2025 167,005    
Total Debt 172,104    
Less:  Current portion of long-term debt (3,700)    
Total long-term debt, net $ 167,839   95,028
1.25% Convertible Senior Notes | Convertible Debt      
Line of Credit Facility [Line Items]      
Stated interest rate (as a percent) 1.25% 1.25%  
Long-term Debt, by Current and Noncurrent [Abstract]      
Unamortized debt issuance costs $ (565)   0
Term Loan And Revolving Credit Facility      
Long-term Debt, by Current and Noncurrent [Abstract]      
Remainder of 2020 0    
2021 0    
2022 0    
2023 0    
2024 0    
2025 167,005    
Total Debt 167,005    
Less:  Current portion of long-term debt 0    
Unamortized debt issuance costs (565)    
Long-term debt, net 166,440    
Financing Obligations      
Finance Obligations      
Remainder of 2020 1,252    
2021 2,880    
2022 916    
2023 51    
2024 0    
2025 0    
Total Debt 5,099    
Less:  Current portion of long-term debt (3,700)   $ (5,432)
Long-term debt, net $ 1,399