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Borrowings - Summary of Carrying Amount of Principal Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Senior convertible notes $ 222,855  
Mann Group promissory notes 53,453 $ 63,027
Total debt — net carrying amount 330,587 122,235
MidCap Credit Facility    
Debt Instrument [Line Items]    
Credit Facility 49,406 49,335
PPP Loan    
Debt Instrument [Line Items]    
PPP loan $ 4,873 4,873
2024 Convertible Notes    
Debt Instrument [Line Items]    
Senior convertible notes   $ 5,000