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Royalty Purchase Agreements (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 25, 2019 USD ($) Agreement | Sep. 20, 2018 USD ($) LicensedProduct | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Royalty Purchase Agreement [Line Items] |  |  |  |  |
Long-term royalty receivables |  |  | $ 15,375,000 | $ 15,000,000 | [1]
Changes in estimated fair value of contingent consideration |  |  | 0 |  |
Royalty Purchase Agreement [Member] | Agenus [Member] |  |  |  |  |
Royalty Purchase Agreement [Line Items] |  |  |  |  |
Payments to acquire milestones and royalties |  |  | 15,000,000 |  |
Long-term royalty receivables |  |  | 15,000,000 | 15,000,000 |
Impairment related to long-term royalty receivable |  |  | 0 | $ 0 |
Royalty Purchase Agreement [Member] | Agenus [Member] | Silicon Valley Bank [Member] |  |  |  |  |
Royalty Purchase Agreement [Line Items] |  |  |  |  |
Loan borrowed |  |  | 7,500,000 |  |
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 |  | $ 59,500,000 |  |  |
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% |  |  |
Royalty Purchase Agreement [Member] | Bioasis Technologies Inc [Member] |  |  |  |  |
Royalty Purchase Agreement [Line Items] |  |  |  |  |
Payments to acquire milestones and royalties |  |  | 300,000 |  |
Long-term royalty receivables |  |  | 400,000 |  |
Impairment related to long-term royalty receivable |  |  | 0 |  |
Percentage of Option to purchase royalty right on future license agreements | 1.00% |  |  |  |
Number of license agreements | Agreement | 2 |  |  |  |
Estimated fair value of contingent consideration |  |  | 100,000 |  |
Royalty Purchase Agreement [Member] | Bioasis Technologies Inc [Member] | Maximum [Member] |  |  |  |  |
Royalty Purchase Agreement [Line Items] |  |  |  |  |
Potential future cash payments |  |  | $ 200,000 |  |
Royalty Purchase Second License Agreement [Member] | Bioasis Technologies Inc [Member] | Maximum [Member] |  |  |  |  |
Royalty Purchase Agreement [Line Items] |  |  |  |  |
Obligation upon exercise of options per licensed product | $ 300,000 |  |  |  |
Royalty Purchase Third License Agreement [Member] | Bioasis Technologies Inc [Member] | Maximum [Member] |  |  |  |  |
Royalty Purchase Agreement [Line Items] |  |  |  |  |
Obligation upon exercise of options per licensed product | $ 400,000 |  |  |  |
[1] | The condensed consolidated balance sheet as of December 31, 2018 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, 2018.

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