Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 3)

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Income Taxes (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance $ 335 $ 199 $ 143 $ 93
Increase (decrease) of unrecognized tax benefits taken in prior years 33 4 (19) 4
Increase of unrecognized tax benefits related to current year 119 132 75 46
Balance $ 487 $ 335 $ 199 $ 143