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Royalty Purchase Agreements - Palobiofarma (Details) $ in Thousands |  | 6 Months Ended | 12 Months Ended
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Sep. 26, 2019 USD ($) item | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Agreements |  |  |  |  |
Payments to acquire milestones and royalties |  |  | $ 6,300 |  |
Proceeds from issuance of long-term debt |  |  | $ 3,000 |  |
Long-term royalty receivables |  | $ 34,375 |  | $ 34,375 | [1]
Impairment of long-term royalty receivable |  | 0 |  | $ 0 |
Increase (decrease) of long-term royalty receivable |  | 0 |  |  |
Royalty Purchase Agreement | Palobiofarma, S.L. |  |  |  |  |
Agreements |  |  |  |  |
Number of drug candidates | item | 6 |  |  |  |
Payments to acquire milestones and royalties | $ 10,000 |  |  |  |
Long-term royalty receivables | 10,000 |  |  |  |
Impairment of long-term royalty receivable |  | $ 0 |  |  |
Royalty Purchase Agreement | Palobiofarma, S.L. | Silicon Valley Bank Loans |  |  |  |  |
Agreements |  |  |  |  |
Proceeds from issuance of long-term debt | $ 5,000 |  |  |  |
[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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