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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Loss per Common Share (Details) - shares | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Loss Per Common Share [Abstract] |  |
Potentially dilutive securities (in shares) | 12,997,322 | 9,265,939
Stock Options [Member] |  |
Loss Per Common Share [Abstract] |  |
Potentially dilutive securities (in shares) | 7,783,029 | 6,801,779
Restricted Stock Units [Member] |  |
Loss Per Common Share [Abstract] |  |
Potentially dilutive securities (in shares) | 686,133 | 326,000
Warrants [Member] |  |
Loss Per Common Share [Abstract] |  |
Potentially dilutive securities (in shares) | 4,528,160 | 2,138,160

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- 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 + Details
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