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Grant Agreements - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020 | Feb. 29, 2020 | Mar. 16, 2018 | Jan. 26, 2018
Grant Revenue [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Revenue from grants |  | $ 1,740,000 | $ 1,166,000 | $ 7,690,000 | $ 6,771,000 |  |  |  |
Bill & Melinda Gates Foundation | Grant Revenue [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Revenue from grants |  | 0 | 0 | 0 | 900,000 |  |  |  |
National Institutes of Health |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Grant awarded amount |  | 5,100,000 |  | 5,100,000 |  |  |  |  |
National Institutes of Health | Grant Revenue [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Revenue from grants |  | 100,000 | 200,000 | 500,000 | 700,000 |  |  |  |
2017 Grant | Bill & Melinda Gates Foundation |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Grant agreement expiration date | May 31, 2019 |  |  |  |  |  |  |  |
2017 Grant | Bill & Melinda Gates Foundation | Maximum |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Grant awarded amount | $ 4,700,000 |  |  |  |  |  |  |  |
Human Immunodeficiency Virus ("HIV") Grant |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Grant awarded amount |  |  |  |  |  |  | $ 8,600,000 |  |
Human Immunodeficiency Virus ("HIV") Grant | Maximum |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Grant awarded amount |  |  |  |  |  |  |  |  | $ 12,200,000
Human Immunodeficiency Virus ("HIV") Grant | Bill & Melinda Gates Foundation | Grant Revenue [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Revenue from grants |  | 800,000 | 500,000 | 6,200,000 | 3,400,000 |  |  |  |
Tuberculosis ("TB") Grant |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Funds received in advance |  |  |  |  |  | $ 3,800,000 |  |  |
Tuberculosis ("TB") Grant | Grant Revenue [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Revenue from grants |  | $ 900,000 | $ 400,000 | $ 1,000,000.0 | $ 1,800,000 |  |  |  |
Tuberculosis ("TB") Grant | Maximum |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |
Grant awarded amount |  |  |  |  |  |  |  | $ 14,900,000 |

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