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Balance Sheet Details - Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Clinical studies $ 362 $ 585
Legal and other professional fees 1,555 1,652
Other 582 547
Total $ 2,499 $ 2,784