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Income from patent arrangement (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income From Patent Arrangement [Abstract]        
Income from intangible assets $ 1 $ 19 $ 1 $ 1,422