Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 25,000	$ 25,000
Charged to costs and expenses	49,361	8,374
Balance at End of Period	70,000	25,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(4,361)	(8,374)
Deferred Tax Asset Valuation Allowance
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	35,041,300	35,331,314
Charged to costs and expenses	1,535,093	269,241
Balance at End of Period	2,208,843	35,041,300
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(34,367,550)	(559,255)
SalesReturnsReservesMember [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	1,101,658	1,486,406
Balance at End of Period	689,000	1,101,658
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(412,658)	(384,748)
SEC Schedule, 12-09, Reserve, Warranty [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	129,837	127,361
Charged to costs and expenses		2,476
Balance at End of Period	75,300	$ 129,837
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	$ (54,537)