Summary of Significant Accounting Policies (Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, at cost:	$ 18,279	$ 20,386
Less — accumulated depreciation and amortization	(12,724)	(16,651)
Total	5,555	3,735
Depreciation expense	1,833	1,448	1,266
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost:	7,448	8,196
Machinery and equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Machinery and equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, at cost:	6,653	7,204
Computer hardware and software | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer hardware and software | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost:	2,354	2,528
Leasehold improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Leasehold improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, at cost:	1,411	2,065
Furniture and fixtures | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Furniture and fixtures | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, at cost:	$ 413	$ 393