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Agenus Royalty Purchase Agreement (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 20, 2018 USD ($) LicensedProduct | Dec. 31, 2018 USD ($)
Royalty Purchase Agreement [Line Items] |  |
Long-term royalty receivables |  | $ 15,000
Royalty Purchase Agreement [Member] | Agenus [Member] |  |
Royalty Purchase Agreement [Line Items] |  |
Payments to acquire milestones and royalties |  | 15,000
Long-term royalty receivables |  | 15,000
Royalty Purchase Agreement [Member] | Agenus [Member] | Silicon Valley Bank [Member] |  |
Royalty Purchase Agreement [Line Items] |  |
Loan borrowed |  | $ 7,500
Royalty Purchase Agreement [Member] | Agenus [Member] | Incyte [Member] |  |
Royalty Purchase Agreement [Line Items] |  |
Number of licensed products related to milestone and royalties | LicensedProduct | 6 |
Royalty Purchase Agreement [Member] | Agenus [Member] | Merck [Member] |  |
Royalty Purchase Agreement [Line Items] |  |
Number of licensed products related to milestone and royalties | LicensedProduct | 1 |
Royalty Purchase Agreement [Member] | Agenus [Member] | Incyte and Merck [Member] |  |
Royalty Purchase Agreement [Line Items] |  |
Purchased eligible milestone payments receivable upon achievement of potential development, regulatory and commercial milestones | $ 59,500 |
Royalty Purchase Agreement [Member] | Agenus [Member] | Right to Receive Low-Single Mid-Teen Royalties [Member] | Incyte [Member] |  |
Royalty Purchase Agreement [Line Items] |  |
Purchased percentage of royalties on net sales of products | 33.00% |
Purchased percentage of milestones | 10.00% |
Royalty Purchase Agreement [Member] | Agenus [Member] | Right to Receive Low Single Digit Royalties [Member] | Merck [Member] |  |
Royalty Purchase Agreement [Line Items] |  |
Purchased percentage of royalties on net sales of products | 33.00% |
Purchased percentage of milestones | 10.00% |

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- Definition Purchased eligible milestone payments receivable upon achievement of potential development regulatory and commercial milestones. + References No definition available. + Details
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- Details
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