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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies      
Additional period for which the entity may elect to extend the term of the lease 5 years    
Additional tenant improvement allowance $ 1,800,000    
Tenant improvement allowance utilized and included in fixed assets and deferred rent 500,000 300,000 500,000
Rent expense 1,020,000 906,000 906,000
Future minimum lease payments under non-cancelable operating leases      
2014 1,118,000    
2015 1,140,000    
2016 1,163,000    
2017 1,186,000    
Thereafter 402,000    
Total $ 5,009,000