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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
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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

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