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Borrowings - Summary of Carrying Amount of Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Mann Group promissory notes $ 70,020 $ 72,089
Senior notes 10,028 19,099
Total debt — net carrying amount 118,899 102,486
Deerfield Credit Facility    
Debt Instrument [Line Items]    
Credit Facility   $ 11,298
MidCap Credit Facility    
Debt Instrument [Line Items]    
Credit Facility $ 38,851