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Liquidity (Details Textual) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
[1]
Jun. 30, 2016
Feb. 29, 2016
Dec. 31, 2015
Liquidity Details [Line Items]          
Cash and cash equivalents $ 50,216,000 $ 66,006,000 $ 81,201,000   $ 87,191,000
General Electric Capital Corporation          
Liquidity Details [Line Items]          
Line of credit maximum borrowing capacity       $ 10,000,000  
[1] Derived from the audited December 31, 2016 financial statements