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Borrowings - Summary of Carrying Amount of Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Mann Group promissory notes $ 63,027 $ 70,020
Total debt — net carrying amount 122,235 118,899
PPP Loan    
Debt Instrument [Line Items]    
PPP Loan 4,873  
MidCap Credit Facility    
Debt Instrument [Line Items]    
Credit Facility 49,335 38,851
2024 Convertible Notes    
Debt Instrument [Line Items]    
Senior notes (2024 convertible notes) $ 5,000 $ 10,028