Property and Equipment - Summary of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total cost	$ 50,421	$ 50,845
Less: Accumulated depreciation	(31,378)	(28,893)
Property and equipment, net	19,043	21,952
Land [Member]
Property, Plant and Equipment [Line Items]
Total cost	2,900	2,900
Building and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	39 years
Total cost	13,922	13,862
Production Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	18,047	18,180
Production Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Production Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	7,789	7,481
Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Furniture and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	2,646	3,359
Furniture and Office Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Furniture and Office Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Total cost	270	270
Website Development Costs [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Total cost	601	601
Capitalized Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Total cost	3,670	3,670
Construction-in-Process [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 576	$ 522