Industry Segment and Operations by Geographic Areas - Revenues By Customer Location (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 11,085,752	$ 6,570,581	$ 33,854,180	$ 18,099,561
U.S [Member]
Segment Reporting Information [Line Items]
Total revenues	9,740,486	5,823,339	30,055,925	14,310,806
Europe [Member]
Segment Reporting Information [Line Items]
Total revenues	1,309,731	735,613	3,609,798	3,565,616
Other [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 35,535	$ 11,629	$ 188,457	$ 223,139