Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Summary of acquisition of Intangible assets
Total assets subject to amortization, Amount	$ 531
Total assets subject to amortization, Weighted-average Amortization Period	5 years
Goodwill	4,717
Customer relationships [Member]
Summary of acquisition of Intangible assets
Total assets subject to amortization, Amount	257
Total assets subject to amortization, Weighted-average Amortization Period	5 years
Trade Name [Member]
Summary of acquisition of Intangible assets
Total assets subject to amortization, Amount	62
Total assets subject to amortization, Weighted-average Amortization Period	5 years
Technology [Member]
Summary of acquisition of Intangible assets
Total assets subject to amortization, Amount	$ 212
Total assets subject to amortization, Weighted-average Amortization Period	5 years