Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 5,000	$ 4,700	$ 3,200
Property and equipment, accumulated depreciation	30,346	$ 24,594
Accelerated depreciation	800
Corvallis Plan [Member]
Property, Plant and Equipment [Line Items]
Accelerated depreciation	$ 800