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Equity Incentive Plan - Company's Equity Incentive Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Feb. 08, 2007
Equity Incentive Plan 2007 [Member]
Feb. 23, 2010
Equity Incentive Plan 2010 [Member]
Aug. 31, 2011
Equity Incentive Plan 2011 [Member]
Equity Incentive Plan [Line Items]        
Total shares authorized   2,000,000 2,000,000 2,000,000
Unrecognized compensation cost related to share-based compensation $ 288      
Expected period of recognition of unrecognized compensation cost 1 year 2 months 26 days