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Borrowings - Milestone Rights - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Remaining milestone rights liability $ 7,300 $ 7,300
Payment for milestone liability 5,000  
Milestone Rights liability — current 1,337  
Milestone rights liability $ 5,926 $ 7,263