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Liability Related to Sale of Future Royalties to RPI - Schedule Represents Allocation of Transaction Consideration on a Relative Fair Value Basis to the Liability and the Common Stock (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Royalty Liability [Abstract]    
Liability related to sale of future royalties beginning balance $ 143,276 $ 122,473
Interest accretion 22,713 20,737
Amortization of issuance costs 79 66
Liability related to sale of future royalties ending balance $ 166,068 $ 143,276