Supplementary Financial Statement Information - Schedule of Accounts Payable and Accruals - Other (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Employees and employee institutions	$ 828	$ 853
Accrued vacation and recreation pay	171	165
Accrued expenses	903	976
Provision for sales commissions	37	109
Other	27	31
Total accounts payable and accruals-other	$ 1,966	$ 2,134