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Borrowings - Summary of Carrying Amount of Principal Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Mann Group promissory notes $ 70,025 $ 70,020
Total debt — net carrying amount 121,825 118,899
Less current portion of long-term debt (45,379) (5,028)
Long-term debt 76,446 113,871
MidCap Credit Facility    
Debt Instrument [Line Items]    
Credit Facility 39,346 38,851
Less current portion of long-term debt (40,000)  
December 2020 Note and 2024 Convertible Notes    
Debt Instrument [Line Items]    
Senior notes 7,581 $ 10,028
PPP Loan    
Debt Instrument [Line Items]    
PPP Loan 4,873  
Less current portion of long-term debt $ (3,500)