Product Sales and Significant Customers and Vendors - Consolidated Dental Sales by Product and by Geographical Region (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Product Information [Line Items]
Total sales	$ 9,491,569	$ 10,333,090
Instruments [Member]
Product Information [Line Items]
Total sales	2,911,614	2,569,102
Handpieces [Member]
Product Information [Line Items]
Total sales	6,409,924	7,627,140
Other [Member]
Product Information [Line Items]
Total sales	170,031	136,848
United States [Member]
Product Information [Line Items]
Total sales	3,295,307	4,655,648
Canada [Member]
Product Information [Line Items]
Total sales	211,035	100,321
Other Foreign [Member]
Product Information [Line Items]
Total sales	$ 5,985,227	$ 5,577,121