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NET LOSS PER SHARE - Anti-dilutive Securities (Details) - shares	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	46,405,617	53,425,800	51,165,310
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	366,982	413,040	396,270
Weighted-average stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	9,419,506	10,981,370	8,737,650
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities (in shares)	36,619,129	42,031,390	42,031,390

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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+ References

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