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RESEARCH COLLABORATION AGREEMENT AND LICENSE AGREEMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Research Collaboration Agreement and License Agreement (Textual)
Research and development expenses	$ 3,459	$ 5,348	$ 7,349
License Agreement and Collaboration Agreement [Member]
Research Collaboration Agreement and License Agreement (Textual)
Total payment obligation	7,200
Research and development expenses	$ 800	$ 1,600	$ 900
Research collaboration agreement expire date	Feb. 16, 2023

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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