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Licensing and Other Arrangements - Sale of Future Revenue Streams (Details) $ in Thousands |  | 12 Months Ended
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Dec. 21, 2016 USD ($) agreement period | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Licensing and other arrangements |  |  |
Unearned revenue recognized under units-of-revenue method |  | $ (1,094) | $ (231)
Revenue recognized under units-of-revenue method |  | 1,094 | 231
Unearned revenue recognized under units-of-revenue method, current |  | 1,096 | 490
Unearned revenue recognized under units-of-revenue method, noncurrent |  | 15,317 | 17,017
Health Care Royalty Partners Two Limited Partners |  |  |
Licensing and other arrangements |  |  |
Unearned revenue recognized under units-of-revenue method | $ 18,000 |  |
Revenue recognized under units-of-revenue method |  | 1,100 | 200
Unearned revenue recognized under units-of-revenue method, current |  | 1,100 | 500
Unearned revenue recognized under units-of-revenue method, noncurrent |  | $ 15,300 | $ 17,000
Health Care Royalty Partners Two Limited Partners | Royalty Interest Acquisition Agreements |  |  |
Licensing and other arrangements |  |  |
Number of agreements | agreement | 2 |  |
Health Care Royalty Partners Two Limited Partners | First Royalty Interest Acquisition 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 |  |
Health Care Royalty Partners Two Limited Partners | Second Royalty Interest Acquisition Agreement |  |  |
Licensing and other arrangements |  |  |
Cash payment received | $ 11,500 |  |

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