Property and Equipment - Summary of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total cost	$ 51,429	$ 50,421
Less: Accumulated depreciation	(33,906)	(31,378)
Property and equipment, net	17,523	19,043
Land
Property, Plant and Equipment [Line Items]
Total cost	2,900	2,900
Building and Leasehold Improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	39 years
Total cost	14,302	13,922
Production Equipment
Property, Plant and Equipment [Line Items]
Total cost	18,443	18,047
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	7,209	7,789
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	3,066	2,646
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	270	270
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	3,670	3,670
Construction-in-Process
Property, Plant and Equipment [Line Items]
Total cost	$ 968	$ 576