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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