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Comprehensive Income (Loss) (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stockholders' Equity Note [Abstract]        
Unrealized gain (loss) on marketable securities, tax $ (18) $ 92 $ (88) $ 0