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STOCK-BASED COMPENSATION - Stock-based compensation expenses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total stock compensation expenses	$ 1,361,000	$ 1,363,000	$ 2,705,365	$ 2,889,243
Research and development
Total stock compensation expenses	528,000	593,000	1,309,000	1,280,000
General and administrative
Total stock compensation expenses	$ 833,000	$ 770,000	$ 1,396,000	$ 1,609,000

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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