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Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cost      
Balance at beginning of year $ 2,516 $ 2,516 $ 2,516
Additions during the year 308
Retirements during the year
Balance at end of year 2,824 2,516 2,516
Accumulated amortization      
Balance at beginning of year 1,229 978 727
Additions during the year 276 251 251
Retirements during the year
Balance at end of year 1,505 1,229 978
Amortized balance 1,319 1,287 1,538
Technology [Member]      
Cost      
Balance at beginning of year 1,955 1,955 1,955
Additions during the year 308
Retirements during the year
Balance at end of year 2,263 1,955 1,955
Accumulated amortization      
Balance at beginning of year 1,199 954 709
Additions during the year 270 245 245
Retirements during the year
Balance at end of year 1,469 1,199 954
Amortized balance 794 756 1,001
Contractual customer relations [Member]      
Cost      
Balance at beginning of year 38 38 38
Additions during the year
Retirements during the year
Balance at end of year 38 38 38
Accumulated amortization      
Balance at beginning of year 30 24 18
Additions during the year 6 6 6
Retirements during the year
Balance at end of year 36 30 24
Amortized balance 2 14 14
Goodwill [Member]      
Cost      
Balance at beginning of year 523 523 523
Additions during the year
Retirements during the year
Balance at end of year 523 523 523
Accumulated amortization      
Balance at beginning of year
Additions during the year
Retirements during the year
Balance at end of year
Amortized balance $ 523 $ 523 $ 523