Organization and Summary of Significant Accounting Policies - Net Sales by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net sales by geographic area	$ 79,643	$ 58,756	$ 158,885	$ 114,286
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	$ 66,200	$ 52,219	$ 130,952	$ 94,687
Percentage of net sales by geographic area	83.10%	88.90%	82.40%	82.90%
Other Countries
Segment Reporting Information [Line Items]
Net sales by geographic area	$ 13,443	$ 6,537	$ 27,933	$ 19,599
Percentage of net sales by geographic area	16.90%	11.10%	17.60%	17.10%