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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Prepaid Expense And Other Assets Current [Abstract] |  |
Prepaid research and development expenses | $ 1,826 | $ 1,679
Short-term deposits | 1,278 | 1,139
Deferred financing expenses | 1,253 | 2,339
Research and development tax credit receivable | 522 | 1,036
Prepaid insurance | 459 | 569
Value added tax receivable | 302 | 68
Other prepaid assets | 126 | 57
Total | $ 5,766 | $ 6,887

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