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A unique description of a noncash or part noncash stock conversion. The description would be expected to include sufficient information to provide an understanding of the nature and purpose of the conversion. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Number of shares issued for each share of convertible preferred stock that is converted.

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A general description of the nature of the existing leasing arrangements of a lessor for all operating leases including, but not limited to: (1) guarantees or indemnities; (2) restrictions imposed by lease arrangements; (3) unusual provisions or conditions; (4) contingent rentals; and (5) lease expiration dates.

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Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

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Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingent Liabilities (Textual)
Non-cancelable outstanding obligations	$ 350
Maximum penalties payable on early release of agreement	39
Total fund received	1,970
Royalties expenses
Lease expiration, term	These leases expire between 2019 and 2023.
Other long-term assets	$ 801
Rent expenses	$ 695	$ 682	$ 650
Initial public offering [Member]
Commitments and Contingent Liabilities (Textual)
Description of conversion ratio	Ordinary shares in a conversion ratio of 1 to 1.
IIA [Member]
Commitments and Contingent Liabilities (Textual)
Royalty bearing grants	$ 1,570
Royalties paid	50
Contingent liability	$ 1,500
Percentage of grant received	100.00%
IIA [Member] \| Minimum [Member]
Commitments and Contingent Liabilities (Textual)
Percentage of obligation to pay royalties	3.00%
IIA [Member] \| Maximum [Member]
Commitments and Contingent Liabilities (Textual)
Percentage of obligation to pay royalties	3.50%
IIA [Member] \| Series A Preferred Stock [Member]
Commitments and Contingent Liabilities (Textual)
Amount received in consideration of preferred shares	$ 400
Convertible preferred shares	5,237
BIRD [Member]
Commitments and Contingent Liabilities (Textual)
Total fund received	$ 500
Percentage of obligation to pay royalties	5.00%
BIRD [Member] \| Maximum [Member]
Commitments and Contingent Liabilities (Textual)
Percentage of obligation to pay royalties	150.00%
RRL [Member]
Commitments and Contingent Liabilities (Textual)
Lease expiration, term	RRL lease cars for its employees under cancelable operating lease agreements expiring at various dates in 2019-2021.