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Licensing and Other Arrangements - NIAID (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2008 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2017 | Dec. 31, 2014
Licensing and other arrangements |  |  |  |  |  |  |  |
Revenue recognized |  | $ 525 | $ 53 | $ 544 | $ 553 |  |  |
Contingent liabilities |  | 1,410 |  | 1,410 |  | $ 1,410 |  |
Arrangement with Governmental Agency | NIAID |  |  |  |  |  |  |  |
Licensing and other arrangements |  |  |  |  |  |  |  |
Total contract amount awarded | $ 64,800 |  |  |  |  |  |  |
Contractual term | 3 years |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  | $ 400
Deferred revenue/Contract liabilities |  |  |  |  |  |  |  | $ 800
Accounts receivable written off |  |  |  |  |  |  | $ 400 |
Estimated refund liability |  |  |  |  |  | 1,400 |  |
Revenue recognized |  |  |  |  |  | (600) |  |
Contingent liabilities |  | $ 1,400 |  | $ 1,400 |  | $ 1,400 |  |

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