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Other Current Assets - Summary of Other Current Assets (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Prepaid expenses | $ 478,560 | $ 471,686
Project deposit | 532,500 |
Deposits | 5,076 | 23,841
Total other current assets | $ 1,016,136 | $ 495,527

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