Organization and Summary of Significant Accounting Policies - Net Sales by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 44,349	$ 35,197	$ 117,709	$ 97,806
Total Net Sales [Member]
Segment Reporting Information [Line Items]
Net sales by Geographic Area	44,349	35,197	117,709	97,806
Percentage of Net sales by Geographic Area	100.00%	100.00%	100.00%	100.00%
United States [Member] | Total Net Sales [Member]
Segment Reporting Information [Line Items]
Net sales by Geographic Area	37,605	31,483	95,336	86,036
Percentage of Net sales by Geographic Area	84.80%	89.40%	81.00%	88.00%
Other Countries [Member] | Total Net Sales [Member]
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 6,744	$ 3,714	$ 22,373	$ 11,770
Percentage of Net sales by Geographic Area	15.20%	10.60%	19.00%	12.00%