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Borrowings - Summary of Carrying Amount of Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Mann Group promissory notes $ 70,022 $ 70,020
Total debt — net carrying amount 119,016 118,899
MidCap Credit Facility    
Debt Instrument [Line Items]    
Credit Facility 38,893 38,851
2020 Notes and 2024 Convertible Notes    
Debt Instrument [Line Items]    
Senior notes $ 10,101 $ 10,028