Significant Customers & Geographical Information - Sales by Product and by Geographical Region (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Product Information [Line Items]
Total sales	$ 1,766,759	$ 2,506,932	$ 4,536,963	$ 5,127,766
Instruments [Member]
Product Information [Line Items]
Total sales	289,755	683,398	1,416,334	1,524,379
Handpieces [Member]
Product Information [Line Items]
Total sales	1,430,141	1,784,982	3,076,655	3,518,197
Other [Member]
Product Information [Line Items]
Total sales	46,863	38,552	43,974	85,190
United States [Member]
Product Information [Line Items]
Total sales	841,614	1,181,374	1,709,176	2,395,018
Canada [Member]
Product Information [Line Items]
Total sales	27,379	47,138	43,356	71,873
Other Foreign [Member]
Product Information [Line Items]
Total sales	$ 897,766	$ 1,278,420	$ 2,784,431	$ 2,660,875