Organization and Summary of Significant Accounting Policies - Net Sales by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 37,175	$ 32,175	$ 73,360	$ 62,609
Total Net Sales [Member]
Segment Reporting Information [Line Items]
Net sales by Geographic Area	37,175	32,175	73,360	62,609
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	32,155	27,239	57,731	54,554
Percentage of Net sales by Geographic Area	86.00%	85.00%	79.00%	87.00%
Other Countries [Member] | Total Net Sales [Member]
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 5,020	$ 4,936	$ 15,629	$ 8,055
Percentage of Net sales by Geographic Area	14.00%	15.00%	21.00%	13.00%