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STOCK-BASED COMPENSATION - Stock-based compensation expenses (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total stock compensation expenses	$ 1,344,592	$ 1,525,976
Research and development
Total stock compensation expenses	781,000	687,000
General and administrative
Total stock compensation expenses	$ 564,000	$ 839,000

X

- 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

+ Details

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- Details

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