Organization and Summary of Significant Accounting Policies - Net Sales by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net sales by geographic area	$ 55,530	$ 44,762
Percentage of net sales by geographic area	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Net sales by geographic area	$ 42,468	$ 35,501
Percentage of net sales by geographic area	76.50%	79.30%
Other Countries
Segment Reporting Information [Line Items]
Net sales by geographic area	$ 13,062	$ 9,261
Percentage of net sales by geographic area	23.50%	20.70%