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

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No definition available.

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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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No definition available.

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Represents the percentage of royalty fees.

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No definition available.

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

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Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingent Liabilities (Textual)
Non-cancelable outstanding obligations	$ 1,350		$ 1,350		$ 350
Maximum penalties payable on early release of agreement	44		44		39
Royalties expenses	8		$ 13
Lease expiration, term			These leases expire between 2019 and 2023.		These leases expire between 2019 and 2023.
Other long-term assets	737		$ 737		$ 801
Lease expense	180	$ 187	$ 560	$ 561	$ 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.		Ordinary shares in a conversion ratio of 1 to 1.
IIA [Member]
Commitments and Contingent Liabilities (Textual)
Royalty bearing grants			$ 1,570		$ 1,570
Royalties paid			50		50
Contingent liability	$ 1,500		$ 1,500		$ 1,500
Percentage of grant received			100.00%		100.00%
IIA [Member] \| Minimum [Member]
Commitments and Contingent Liabilities (Textual)
Percentage of obligation to pay royalties			3.00%		3.00%
IIA [Member] \| Maximum [Member]
Commitments and Contingent Liabilities (Textual)
Percentage of obligation to pay royalties			3.50%		3.50%
IIA [Member] \| Series A Preferred Stock [Member]
Commitments and Contingent Liabilities (Textual)
Amount received in consideration of preferred shares			$ 400		$ 400
Convertible preferred shares	209		209
BIRD [Member]
Commitments and Contingent Liabilities (Textual)
Total fund received			$ 500		$ 500
Percentage of obligation to pay royalties			5.00%		5.00%
BIRD [Member] \| Maximum [Member]
Commitments and Contingent Liabilities (Textual)
Percentage of obligation to pay royalties			150.00%		150.00%
RRL [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.		RRL lease cars for its employees under cancelable operating lease agreements expiring at various dates in 2019-2021.
Kreos Capital V [Member]
Commitments and Contingent Liabilities (Textual)
Line of credit	$ 20,000		$ 20,000