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 |