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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Prepaid Expenses and Other Current Assets |  |
Prepaid research and development expenses | $ 1,608,768 | $ 2,941,196
Other prepaid expenses | 329,634 | 251,733
Other receivables | 413,122 | 101,955
Prepaid expenses and other current assets | $ 2,351,524 | $ 3,294,884

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