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Balance Sheet Components - Accrued Expenses and Other Payables (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Balance Sheet Components    
Accrued clinical and research related expenses $ 6,420 $ 7,781
Accrued employee related expenses 3,480 2,726
Accrued professional service fees 376 61
Other 210 595
Total accrued expenses and other payables $ 10,486 $ 11,163