Supplementary Financial Statements Information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Current Assets:
Prepaid expenses	$ 926	$ 164
Government departments and agencies receivables	11	129
Others		46
Other current assets	$ 937	$ 339

Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant