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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Schedule of assets and liabilities measured at fair value on recurring basis |  |
Interest Rate Derivative Liabilities, at Fair Value Disclosure | $ 275 | $ 295
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 | 275 | 295
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 | 12,564 | 6,824
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 | 12,564 | 6,824
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
Government agency bonds [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 1,501 | 3,502
Government agency bonds [Member] | Fair Value, Inputs, Level 1 |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 1,501 | 3,502
Government agency bonds [Member] | Fair Value, Inputs, Level 2 |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Government agency bonds [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 | 2,004 | 4,006
US Treasury Securities | Fair Value, Inputs, Level 1 |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 2,004 | 4,006
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 | 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 | 0
Municipal Bonds [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 775 | 1,359
Municipal Bonds [Member] | Fair Value, Inputs, Level 1 |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 775 | 1,359
Municipal Bonds [Member] | Fair Value, Inputs, Level 3 |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 0 | 0
Corporate notes [Member] |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 3,609 | 4,667
Corporate notes [Member] | Fair Value, Inputs, Level 1 |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 3,609 | 4,667
Corporate notes [Member] | Fair Value, Inputs, Level 2 |  |
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 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 | 7,119 | 4,155
Certificates of Deposit | Fair Value, Inputs, Level 1 |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |
Assets, Fair Value Disclosure | 7,119 | 4,155
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

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