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STOCKHOLDERS' EQUITY - Stock options (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
STOCKHOLDERS' EQUITY |  |  |
Number of Options, Grants |  | 20,000 |
Stock options |  |  |
STOCKHOLDERS' EQUITY |  |  |
Number of Options, Outstanding at Beginning of Year | 3,771,000 |  |
Number of Options, Grants | 6,887 |  |
Number of Options, Exercised | 0 |  |
Number of Option, Forfeited/cancelled/expired/settled | 0 |  |
Number of Options, Balance at End of Year | 3,778,000 |  | 3,771,000
Number of Options, Vested and expected to vest | 3,777,000 |  |
Number of Options, Unvested | 11,000 |  |
Number of Options, Exercisable | 3,767,000 |  |
Weighted-Average Exercise Price, Outstanding at Beginning of Year (in dollars per share) | $ 2.18 |  |
Weighted-Average Exercise Price, Grants (in dollars per share) | 3.63 |  |
Weighted-Average Exercise Price, Exercised (in dollars per share) | 0 |  |
Weighted-Average Exercise Price, Forfeited/cancelled/expired/settled (in dollars per share) | 0 |  |
Weighted-Average Exercise Price, Balance at End of Year (in dollars per share) | 2.18 |  | $ 2.18
Weighted-Average Exercise Price, Vested and expected to vest (in dollars per share) | 2.18 |  |
Weighted-Average Exercise Price, Unvested (in dollars per share) | 7.26 |  |
Weighted-Average Exercise Price, Exercisable (in dollars per share) | $ 2.16 |  |
Weighted-Average Remaining Contractual Term, Outstanding (in years) | 5 years 5 months 8 days |  | 5 years 8 months 4 days
Weighted-Average Remaining Contractual Term, Grants (in years) | 0 years |  |
Weighted-Average Remaining Contractual Term, Exercised (in years) | 0 years |  |
Weighted-Average Remaining Contractual Term, Forfeited/cancelled/expired/settled (in years) | 0 years |  |
Weighted-Average Remaining Contractual Term, Vested and expected to vest (in years) | 5 years 5 months 8 days |  |
Weighted-Average Remaining Contractual Term, Unvested (in years) | 9 years 6 months 3 days |  |
Weighted-Average Remaining Contractual Term, Exercisable (in years) | 5 years 5 months 4 days |  |
Aggregate Intrinsic Value, Outstanding | $ 11,270,000 |  | $ 4,660,000
Aggregate Intrinsic Value, Grants | 0 |  |
Aggregate Intrinsic Value, Exercised | 0 |  |
Aggregate Intrinsic Value, Forfeited/cancelled/expired/settled | 0 |  |
Aggregate Intrinsic Value, Vested and expected to vest | 11,270,000 |  |
Aggregate Intrinsic Value, Unvested | 0 |  |
Aggregate Intrinsic Value, Exercisable | $ 11,270,000 |  |

X
- Definition Weighted average remaining contractual term for option awards Exercised, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards forfeited, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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