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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of assets and liabilities measured at fair value on recurring basis    
Interest Rate Derivative Liabilities, at Fair Value Disclosure $ 258 $ 238
Fair Value, Inputs, Level 1    
Schedule of assets and liabilities measured at fair value on recurring basis    
Interest Rate Derivative Liabilities, at Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2    
Schedule of assets and liabilities measured at fair value on recurring basis    
Interest Rate Derivative Liabilities, at Fair Value Disclosure 258 238
Fair Value, Inputs, Level 3    
Schedule of assets and liabilities measured at fair value on recurring basis    
Interest Rate Derivative Liabilities, at Fair Value Disclosure 0 0
Money market mutual funds [Member]    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 15,551 13,244
Money market mutual funds [Member] | Fair Value, Inputs, Level 1    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 15,551 13,244
Money market mutual funds [Member] | Fair Value, Inputs, Level 2    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 0 0
Money market mutual funds [Member] | Fair Value, Inputs, Level 3    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 0 0
US Treasury Securities    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure   1,002
US Treasury Securities | Fair Value, Inputs, Level 1    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure   1,002
US Treasury Securities | Fair Value, Inputs, Level 2    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure   0
US Treasury Securities | Fair Value, Inputs, Level 3    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure   0
Corporate notes [Member]    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 1,001 2,284
Corporate notes [Member] | Fair Value, Inputs, Level 1    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 0 0
Corporate notes [Member] | Fair Value, Inputs, Level 2    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 1,001 2,284
Corporate notes [Member] | Fair Value, Inputs, Level 3    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 0 0
Certificates of Deposit    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 6,086 6,089
Certificates of Deposit | Fair Value, Inputs, Level 1    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 6,086 6,089
Certificates of Deposit | Fair Value, Inputs, Level 2    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure 0 0
Certificates of Deposit | Fair Value, Inputs, Level 3    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets, Fair Value Disclosure $ 0 $ 0