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Borrowings - Facility Financing Obligation - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Milestone rights liability $ 7,263 $ 7,263 $ 7,201
Deerfield | Facility Financing Obligation      
Debt Instrument [Line Items]      
Remaining milestone rights liability 7,300 7,300 $ 8,900
Payment for milestone liability 5,000    
Milestone rights liability, current 1,600 1,600  
Milestone interest expense   3,400  
Milestone rights liability $ 7,300 $ 7,300