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Summary of Remaining Unrecognized Share based Compensation of Stock Option (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Allocated Share-based Compensation Expense | $ 1,441,089 | $ 2,743,116
General and Administrative Expense [Member] |  |
Allocated Share-based Compensation Expense | $ 809,528 | $ 2,113,116

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