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Summary of Carrying Amount of Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Senior convertible notes $ 9,957 $ 19,099
Mann Group promissory notes 70,019 72,089
Total debt - net carrying amount 118,774 102,486
Deerfield Credit Facility    
Debt Instrument [Line Items]    
Credit Facility   $ 11,298
MidCap Credit Facility    
Debt Instrument [Line Items]    
Credit Facility $ 38,798