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Summary of Remaining Unrecognized Share based Compensation of Stock Option (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Allocated Share-based Compensation Expense $ 345,134 $ 833,944
General and Administrative Expense [Member]    
Allocated Share-based Compensation Expense $ 202,382 $ 202,382