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Restricted Cash (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jan. 31, 2014
Subsequent Event [Member]
Dec. 31, 2013
Comerica Bank [Member]
New Jersey [Member]
Dec. 31, 2013
Comerica Bank [Member]
Colorado [Member]
Restricted Cash and Cash Equivalents Items [Line Items]            
Cash $ 2,294 $ 2,218 $ 1,818      
Restricted cash 242     185    
Letters of credit outstanding, amount         $ 57 $ 185