RESEARCH AND DEVELOPMENT EXPENSES, NET (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Research and Development Expenses [Line Items]
Share-based compensation	$ (65)	$ 726	$ 1,209
Total research and development, net	7,618	6,837	5,491
Research and development, net [Member]
Research and Development Expenses [Line Items]
Salaries and related expenses	4,410	4,656	4,683
Share-based compensation	234	116	234
Materials	1,508	614	596
Subcontractors and consultants	311	456	320
Depreciation	138	147	121
Cost for registration of patents	126	157	150
Others	1,099	893	511
Research and development	7,826	7,039	6,615
Less participation of the NATI and BIRD Foundation	(208)	(202)	(1,124)
Total research and development, net	$ 7,618	$ 6,837	$ 5,491

Revenue fron grant.

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The gross recognized cost of research and development during the period, before accounting for costs covered by grants.

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Research and Development Expenses [Line Items]

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Fees for the services provided by subcontractors and consultants during the period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Amount of expense for salary and wage arising from service rendered by nonofficer and officer employees. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold.

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Amount of expense associated with supplies that were used during the current accounting period.

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