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Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Compensation and employee benefits $ 8,129 $ 6,597
Research and development expenses 6,089 5,893
Consulting and other professional fees 5,847 5,376
Royalties payable 5,211 5,904
Operating lease liabilities 1,978 2,147
Other 1,832 1,673
Total accounts payable and accrued liabilities $ 29,086 $ 27,590