XML 119 R105.htm IDEA: XBRL DOCUMENT v3.19.1
Comprehensive Income (Loss) (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stockholders' Equity Note [Abstract]      
Unrealized gain (loss) on marketable securities, tax $ (18) $ 28 $ 16