Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Technology fees	$ 450,000	$ 450,000
Sales return allowance	323,403	488,200
Professional services	161,000	390,800
Clinical studies	103,000	25,000
Warranty reserve	79,104	45,879
Advertising and promotion	70,600	28,100
Other	207,869	220,752
Accrued expenses	$ 1,394,976	$ 1,648,731