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STOCKHOLDERS' EQUITY - EQUITY PLANS - SCHEDULE OF AGGREGATE OPTION AND AWARD ACTIVITY (Parenthetical) (Details) - shares	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2019
STOCKHOLDERS' EQUITY
Outstanding Stock Options (in shares)		43,663,691	37,614,013
Common stock, shares reserved for future issuance		118,156,885
2018 Inducement Award Plan
STOCKHOLDERS' EQUITY
Common stock, shares reserved for future issuance		9,300,000
Subsequent Event | 2018 Inducement Award Plan
STOCKHOLDERS' EQUITY
Common stock, shares reserved for future issuance	10,100,000
Performance-Based Stock Options
STOCKHOLDERS' EQUITY
Outstanding Stock Options (in shares)		5,500,000

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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+ References

No definition available.

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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