Organization and Summary of Significant Accounting Policies - Net Sales by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net sales by geographic area	$ 71,882	$ 50,376	$ 186,168	$ 141,851
Percentage of net sales by geographic area	100.00%	100.00%	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Net sales by geographic area	$ 60,558	$ 43,689	$ 155,245	$ 117,885
Percentage of net sales by geographic area	84.20%	86.70%	83.40%	83.10%
Other Countries
Segment Reporting Information [Line Items]
Net sales by geographic area	$ 11,324	$ 6,687	$ 30,923	$ 23,966
Percentage of net sales by geographic area	15.80%	13.30%	16.60%	16.90%