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Grant Award - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 33 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Aug. 31, 2020 | Jun. 30, 2020 | Apr. 30, 2020 | Jul. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount awarded for grant |  |  |  | $ 731,000 |  |  |  |  |  | $ 1,900,000 |
Grants receivable | $ 69,000 |  |  |  |  | $ 69,000 |  | $ 69,000 |  | 69,000 |
Deferred grant funding | 2,178,379 |  |  |  |  | 2,178,379 |  | 2,178,379 |  | 2,178,379 | $ 2,019,674
Grant, Ovaprene |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credits recorded to research and development expense for costs related to award |  |  |  |  |  | 124,000 | $ 302,000 | 583,000 | $ 920,000 |  |
Grant, DARE-FRT1 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount awarded for grant |  | $ 300,000 |  |  |  |  |  |  |  |  |
Credits recorded to research and development expense for costs related to award |  |  |  |  |  | 3,000 |  |  |  |  |
Additional potential grant funding |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |
Receivable for expenses eligible for reimbursement | 3,000 |  |  |  |  | 3,000 |  | 3,000 |  | 3,000 |
Grant | National Institutes of Health |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred grant funding | 2,200,000 |  |  |  |  | $ 2,200,000 |  | $ 2,200,000 |  | $ 2,200,000 |
Grant | Bill And Melinda Gates Foundation |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from grant for notice of award | $ 899,000 |  | $ 1,600,000 |  | $ 2,900,000 |  |  |  |  |  |

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