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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Prepaid Expenses and Other Current Assets |  |
Prepaid research and development expenses | $ 3,105,222 | $ 3,838,835
Other prepaid expenses | 358,821 | 301,534
Other receivables | 49,362 | 185,953
Prepaid expenses and other current assets | $ 3,513,405 | $ 4,326,322

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