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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid clinical and research related expenses $ 2,567 $ 686
Prepaid insurance 1,161 438
Other prepaid expenses 1,057 1,005
Other receivable 744 495
Prepaid expenses and other current assets $ 5,529 $ 2,624