Organization and Summary of Significant Accounting Policies - Net Sales by Geographic Area (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 32,175,797	$ 28,222,443	$ 62,609,449	$ 53,863,835
Percentage of Net sales by Geographic Area	100.00%	100.00%	100.00%	100.00%
United States [Member]
Segment Reporting Information [Line Items]
Net sales by Geographic Area	27,240,212	23,393,683	54,554,200	45,005,597
Percentage of Net sales by Geographic Area	85.00%	83.00%	87.00%	84.00%
Other Countries [Member]
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 4,935,585	$ 4,828,760	$ 8,055,249	$ 8,858,238
Percentage of Net sales by Geographic Area	15.00%	17.00%	13.00%	16.00%