Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of assets and liabilities measured at fair value on recurring basis
Interest Rate Derivative Liabilities, at Fair Value Disclosure	$ 131	$ 158
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	131	158
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	14,233	21,848
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	14,233	21,848
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
Certificates of Deposit
Schedule of assets and liabilities measured at fair value on recurring basis
Assets, Fair Value Disclosure	2,510	3,864
Certificates of Deposit | Fair Value, Inputs, Level 1
Schedule of assets and liabilities measured at fair value on recurring basis
Assets, Fair Value Disclosure	2,510	3,864
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