Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Technology fees	$ 450,000	$ 450,000
Sales return allowance	413,871	488,200
Professional services	363,000	390,800
Advertising and promotion	115,400	28,100
Clinical studies	104,000	25,000
Warranty reserve	98,286	45,879
Other	201,999	220,752
Accrued expenses	$ 1,746,556	$ 1,648,731