Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Sales return allowance	$ 663,306	$ 1,101,658
Technology fees	450,000	450,000
ContractManufacturer	455,000	160,000
Professional services	363,000	391,000
Operating Lease, Liability, Current	585,692	577,460
Warranty reserve	92,000	129,837
Accrued Advertising	373,000	171,000
Accrued Salaries	133,012	223,756
Other	161,203	133,580
Accrued expenses	$ 2,612,907	$ 2,236,633