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STOCK OPTIONS - Summary of Nonvested Stock Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Number of options |  |
Number of Options Non-vested at beginning of period (in shares) | 2,044,469 |
Number of Options Non-vested, Granted (in shares) | 894,980 | 1,376,900
Number of Options Non-vested, Vested (in shares) | (952,332) |
Number of Options Non-vested, Forfeited (in shares) | (184,901) |
Number of Options Non-vested at end of period (in shares) | 1,802,216 | 2,044,469
Weighted average grant date fair value |  |
Weighted average grant date fair value, Non-vested Options at beginning of period (in dollars per share) | $ 4.61 |
Weighted average grant date fair value, Non-vested Options, Granted (in dollars per share) | 5.76 | $ 4.78
Weighted average grant date fair value, Non-vested Options, Vested (in dollars per share) | 4.49 |
Weighted average grant date fair value, Non-vested Options, Forfeited (in dollars per share) | 5.21 |
Weighted average grant date fair value, Non-vested Options at end of period (in dollars per share) | $ 5.21 | $ 4.61

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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