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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2014
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Contract assets | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |
Contract liability | 3,386 |  |  |  | $ 254 |  |  |  | 3,386 | $ 254 |  |
Revenue, contract liabilities |  |  |  |  |  |  |  |  | 200 |  |  |
Revenues | 3,786 | $ 668 | $ 236 | $ 2,728 | $ 887 | $ 546 | $ 715 | $ 1,425 | 7,418 | 3,573 | $ 9,538 |
Product development and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,301 | 473 | 3,341 |
Contracts and grants |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,117 | 3,100 | 6,197 |
Rockefeller | Product development and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue, contract liabilities |  |  |  | $ 1,800 |  |  |  |  |  |  |  |
Rockefeller | Contracts and grants |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,500 | 2,600 | 3,200 |
Bristol-Myers Squibb Company | Product development and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | $ 200 | $ 3,300 |
Deferred Revenue | $ 0 |  |  |  |  |  |  |  | 0 |  |  | $ 5,000
Reimbursement of external costs (as percent) |  |  |  |  |  |  |  |  |  |  |  | 50.00%
IAVI & Frontier | Contracts and grants |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 400 |  |  |

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