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STOCK OPTIONS - Summary of Nonvested Stock Options (Details) - $ / shares |  | 12 Months Ended
--- | --- | ---
Jan. 29, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Number of options |  |  |
Number of Options Non-vested at beginning of period (in shares) |  | 1,484,929 |
Number of Options Non-vested, Granted (in shares) | 700,000 | 1,376,900 | 1,379,500
Number of Options Non-vested, Vested (in shares) |  | (665,510) |
Number of Options Non-vested, Forfeited (in shares) |  | (151,850) |
Number of Options Non-vested at end of period (in shares) |  | 2,044,469 | 1,484,929
Weighted average grant date fair value |  |  |
Weighted average grant date fair value, Non-vested Options at beginning of period (in dollars per share) |  | $ 4.11 |
Weighted average grant date fair value, Non-vested Options, Granted (in dollars per share) |  | 4.78 | $ 4.57
Weighted average grant date fair value, Non-vested Options, Vested (in dollars per share) |  | 3.77 |
Weighted average grant date fair value, Non-vested Options, Forfeited (in dollars per share) |  | 4.53 |
Weighted average grant date fair value, Non-vested Options at end of period (in dollars per share) |  | $ 4.61 | $ 4.11

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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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + 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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