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Balance Sheet Disclosures - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Compensation related accruals $ 2,688 $ 1,165
Accrued clinical trial expense 699 620
Other expenses 3,566 2,352
Warrant liability, current   43
Total accrued liabilities $ 6,953 $ 4,180