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Licensing and Other Arrangements - Sale of Future Revenue Streams (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 21, 2016 USD ($) agreement period | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Licensing and other arrangements |  |  |  |  |  |
Unearned revenue recognized under units-of-revenue method |  |  |  | $ (815) | $ (731) |
Revenue recognized under units-of-revenue method |  | $ 458 | $ 376 | 815 | 731 |
Unearned revenue recognized under units-of-revenue method, current |  | 1,669 |  | 1,669 |  | $ 1,641
Unearned revenue recognized under units-of-revenue method, noncurrent |  | 10,842 |  | 10,842 |  | 11,685
HealthCare Royalty Partners II, L.P |  |  |  |  |  |
Licensing and other arrangements |  |  |  |  |  |
Revenue recognized under units-of-revenue method |  | 500 | $ 400 | 800 | $ 700 |
HealthCare Royalty Partners II, L.P | Royalty Sale Agreements |  |  |  |  |  |
Licensing and other arrangements |  |  |  |  |  |
Number of agreements | agreement | 2 |  |  |  |  |
Unearned revenue recognized under units-of-revenue method | $ 18,000 |  |  |  |  |
Unearned revenue recognized under units-of-revenue method, current |  | 1,700 |  | 1,700 |  | 1,600
Unearned revenue recognized under units-of-revenue method, noncurrent |  | $ 10,800 |  | $ 10,800 |  | $ 11,700
HealthCare Royalty Partners II, L.P | First Royalty Sale Agreement |  |  |  |  |  |
Licensing and other arrangements |  |  |  |  |  |
Cash payment received | 6,500 |  |  |  |  |
Eligible potential additional payments receivable upon achievement of specified net sales milestones in future years | $ 4,000 |  |  |  |  |
Number of milestone periods | period | 3 |  |  |  |  |
HealthCare Royalty Partners II, L.P | Second Royalty Sale Agreement |  |  |  |  |  |
Licensing and other arrangements |  |  |  |  |  |
Cash payment received | $ 11,500 |  |  |  |  |

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