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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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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

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