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STOCKHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2023
STOCKHOLDERS' EQUITY |
Schedule of transaction and other information relating to stock options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted-Average |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | Aggregate
​ | ​ | Number of | ​ | Weighted-Average | ​ | Contractual Term | ​ | Intrinsic
​ | ​ | Options | ​ | Exercise Price | ​ | (In Years) | ​ | Value
Outstanding at December 31, 2022 |  | 4,594,734 | ​ | $ | 2.59 |  | 5.72 | ​ | $ | 5,871,492
Grants |  | 439,429 | ​ | ​ | 5.14 |  | — | ​ |  | —
Exercised |  | — | ​ | ​ | — |  | — | ​ |  | —
Forfeited/cancelled/expired/settled |  | — | ​ | ​ | — |  | — | ​ |  | —
Balance as of March 31, 2023 |  | 5,034,163 | ​ | $ | 2.81 |  | 5.86 | ​ | $ | 13,575,645
Vested and expected to vest at March 31, 2023 |  | 4,982,498 | ​ | ​ | 2.80 |  | 5.82 | ​ | ​ | 13,510,620
Unvested at March 31, 2023 |  | 441,730 | ​ | ​ | 4.28 |  | 9.51 | ​ | ​ | 539,477
Exercisable at March 31, 2023 |  | 4,592,433 | ​ | ​ | 2.67 |  | 5.51 | ​ | ​ | 13,036,168
Schedule of transaction and other information relating to restricted stock grants | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Average
​ | ​ | ​ | ​ | Fair Value
​ | ​ | ​ | ​ | at Grant
​ | ​ | Shares | ​ | Date
Unvested at December 31, 2022 |  | 434,264 | ​ | $ | 4.27
Grants |  | 743,599 | ​ | ​ | 5.13
Vested |  | (771,729) | ​ | ​ | 5.04
Forfeited/cancelled/expired |  | — | ​ | ​ | —
Unvested at March 31, 2023 |  | 406,134 | ​ | $ | 4.39

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&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 (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: 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) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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