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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 ($) agreement period | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | [1]
Licensing and other arrangements |  |  |  |  |  |
Unearned revenue recognized under units-of-revenue method |  |  |  | $ (695) | $ (442) |
Revenue recognized under units-of-revenue method |  | $ 391 | $ 337 | 695 | 442 |
Unearned revenue recognized under units-of-revenue method, current |  | 1,393 |  | 1,393 |  | $ 1,096
Unearned revenue recognized under units-of-revenue method, noncurrent |  | 14,325 |  | 14,325 |  | $ 15,317
Health Care Royalty Partners Two Limited Partners |  |  |  |  |  |
Licensing and other arrangements |  |  |  |  |  |
Number of agreements | agreement | 2 |  |  |  |  |
Unearned revenue recognized under units-of-revenue method | $ 18,000 |  |  |  |  |
Revenue recognized under units-of-revenue method |  | 400 | $ 300 | 700 | $ 400 |
Unearned revenue recognized under units-of-revenue method, current |  | 1,400 |  | 1,400 |  |
Unearned revenue recognized under units-of-revenue method, noncurrent |  | $ 14,300 |  | $ 14,300 |  |
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 |  |  |  |  |  |
Initial 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 |  |  |  |  |  |
Initial payment received | $ 11,500 |  |  |  |  |
[1] | The consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.

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