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Basis of Presentation and Significant Accounting Policies - Inventories (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Inventories:    
Raw material $ 126,070 $ 142,491
Work in process 4,357,554 2,429,075
Finished goods 3,458,752 2,755,396
Inventory, Total $ 7,942,376 $ 5,326,962