Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Payables and Accruals [Abstract]
Sales return allowance	$ 741,607	$ 1,101,658
Technology fees	450,000	450,000
ContractManufacturer	590,000	160,000
Professional services	566,000	391,000
Operating Lease, Liability, Current	582,940	577,460	$ 582,940
Warranty reserve	103,000	129,837
Accrued Relocation Costs	100,000	0
Accrued Advertising	380,000	171,000
Accrued Salaries	162,990	223,756
Other	146,262	133,580
Accrued expenses	$ 3,081,192	$ 2,236,633