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Comprehensive Income (Loss) (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stockholders' Equity Note [Abstract]        
Unrealized gain (loss) on marketable securities, tax $ (11) $ (26) $ (70) $ (92)