Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Cash equivalents [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Assets, Fair Value Measurements	$ 12,838	$ 10,133
Cash equivalents [Member] | Level 1 [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Assets, Fair Value Measurements	12,838	10,133
Cash equivalents [Member] | Level 2 [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Assets, Fair Value Measurements	0	0
Cash equivalents [Member] | Level 3 [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Assets, Fair Value Measurements	0	0
Earn-out-cash [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Liabilities, Fair Value Measurements	719	765
Earn-out-cash [Member] | Level 1 [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Liabilities, Fair Value Measurements	0	0
Earn-out-cash [Member] | Level 2 [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Liabilities, Fair Value Measurements	0	0
Earn-out-cash [Member] | Level 3 [Member]
Financial assets and liabilities measured and recognized at fair value on a recurring basis
Liabilities, Fair Value Measurements	$ 719	$ 765