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Licensing and Other Arrangements - NIAID (Details) - NIAID - Arrangement with Governmental Agency - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2008 | Dec. 31, 2017 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2014
Licensing and other arrangements |  |  |  |  |
Total contract amount awarded | $ 64.8 |  |  |  |
Contractual term | 3 years |  |  |  |
Accounts receivable |  |  |  |  | $ 0.4
Deferred revenue/Contract liabilities |  |  | $ 0.8 | $ 0.8 | $ 0.8
Accounts receivable written off |  | $ 0.4 |  |  |

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