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Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts Payable And Accrued Liabilities Current [Abstract]    
Accrued research and development $ 1,524 $ 1,387
Accrued salaries and benefits 1,425 2,061
Accrued legal fees 146 82
Accrued professional fees 46 117
Accrued other liabilities 136 129
Total accrued and other current liabilities $ 3,277 $ 3,776