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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued compensation $ 1,855 $ 965
Accrued clinical and research and development expenses 2,405 1,569
Accrued property, equipment and software purchases 261 219
Accrued deferred offering costs   193
Deferred rent 390 198
Accrued legal fees 240 107
Accrued property and franchise taxes 213 63
Other 445 107
Total accrued expenses and other current liabilities $ 5,809 $ 3,421