Fair Value Measurement (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financial assets:
Total financial assets	$ 4,084	$ 4,084
Financial liabilities:
Total financial liabilities	246	231
Money market investment [Member]
Financial assets:
Total financial assets	4,084	4,084
Contingent earnout consideration [Member]
Financial liabilities:
Total financial liabilities	246	231
Quoted Prices in Active Markets for Identical Items (Level 1) [Member]
Financial assets:
Total financial assets	4,084	4,084
Financial liabilities:
Total financial liabilities
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Money market investment [Member]
Financial assets:
Total financial assets	4,084	4,084
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Contingent earnout consideration [Member]
Financial liabilities:
Total financial liabilities
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Total financial assets
Financial liabilities:
Total financial liabilities
Significant Other Observable Inputs (Level 2) [Member] | Money market investment [Member]
Financial assets:
Total financial assets
Significant Other Observable Inputs (Level 2) [Member] | Contingent earnout consideration [Member]
Financial liabilities:
Total financial liabilities
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Total financial assets
Financial liabilities:
Total financial liabilities	246	231
Significant Unobservable Inputs (Level 3) [Member] | Money market investment [Member]
Financial assets:
Total financial assets
Significant Unobservable Inputs (Level 3) [Member] | Contingent earnout consideration [Member]
Financial liabilities:
Total financial liabilities	$ 246	$ 231