Industry Segment and Operations by Geographic Areas - Summary of Revenues by Customer Location (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues by customer location	$ 5,507,824	$ 5,685,917	$ 15,873,590	$ 17,074,401
United States of America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues by customer location	4,390,966	4,881,106	13,063,929	13,083,259
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues by customer location	1,047,748	787,368	2,585,655	3,448,121
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues by customer location	$ 69,110	$ 17,443	$ 224,006	$ 543,021