Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total cost	$ 61,803	$ 57,868
Less: Accumulated depreciation	(37,799)	(36,020)
Property and equipment, net	24,004	21,848
Land
Property, Plant and Equipment [Line Items]
Total cost	2,900	2,900
Building and Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total cost	$ 15,295	15,246
Building and Leasehold Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Building and Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years
Production Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 19,849	18,689
Production Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Production Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Computer Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 7,985	8,048
Computer Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Furniture and Office Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 4,990	4,116
Furniture and Office Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Furniture and Office Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Vehicles
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Total cost	$ 675	713
Website Development Costs
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Total cost	$ 601	601
Capitalized Software Development Costs
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Total cost	$ 3,695	3,670
Construction-in-Process
Property, Plant and Equipment [Line Items]
Total cost	$ 5,813	$ 3,885