Organization and Summary of Significant Accounting Policies - Net Sales by Geographic Area (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 35,196,822	$ 28,772,956	$ 97,806,271	$ 82,636,791
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	31,483,000	23,335,000	86,036,000	68,341,000
Percentage of Net sales by Geographic Area	89.00%	81.00%	88.00%	83.00%
Other Countries [Member]
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 3,714,000	$ 5,438,000	$ 11,770,000	$ 14,296,000
Percentage of Net sales by Geographic Area	11.00%	19.00%	12.00%	17.00%