Inventories (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Inventory [Line Items]
Inventory Valuation Reserves	$ 2,181,819
Purchased components	1,226,434		$ 1,767,674
Inventory Write-down	(2,595,884)	$ 0
Finished goods	836,997		1,094,190
Inventories	2,063,431		$ 2,861,864
PurchasedComponents [Member]
Inventory [Line Items]
Inventory Valuation Reserves	(2,030,000)
FinishedGoods [Member]
Inventory [Line Items]
Inventory Valuation Reserves	$ (151,819)