Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Commitments and Contingent Liabilities (Textual)
Non-cancelable outstanding obligations	$ 323
Maximum penalties payable on early release of agreement	45
Royalties paid	3
Royalties expenses	$ 3
Lease expiration, term	These leases expire between 2019 and 2023.
Other long-term assets	$ 812
Lease expense	$ 178	$ 186
Initial public offering [Member]
Commitments and Contingent Liabilities (Textual)
Description of conversion ratio	Ordinary shares in a conversion ratio of 1 to 1.
Kreos Capital V [Member]
Commitments and Contingent Liabilities (Textual)
Line of credit	$ 20,000
IIA [Member]
Commitments and Contingent Liabilities (Textual)
Total fund received	1,970
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	209
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 and RRG [Member]
Commitments and Contingent Liabilities (Textual)
Lease expiration, term	RRL and RRG lease cars for their employees under cancelable operating lease agreements expiring at various dates in between 2019 and 2022.

No definition available.

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Represents the contingent liability related to grant received as of the balance sheet date.

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Represents the maximum amount of penalties payable on early release of lease agreement.

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Represents the percentage of grant received considered to determine royalty fees.

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Represents the portion of aggregate amount received in consideration of convertible preferred shares by the entity to fund research and development activity.

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Represents the portion of aggregate amount received as royalty bearing grants by the entity to fund research and development activity.

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Represents the percentage of royalty fees.

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- Definition

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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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of operating lease expense. Excludes sublease income.

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Amount of long-term debt classified as other.

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The amount of cash paid for royalties during the current period.

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Cash received for royalties during the current period.

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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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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