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STOCK OPTIONS - Summary of Nonvested Stock Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of options |  |  |
Number of Options Non-vested at beginning of period (in shares) | 1,436,429 |  |
Number of Options Non-vested, Granted (in shares) | 1,379,500 | 225,000 | 1,728,000
Number of Options Non-vested, Vested (in shares) | (1,119,000) |  |
Number of Options Non-vested, Forfeited (in shares) | (212,000) |  |
Number of Options Non-vested at end of period (in shares) | 1,484,929 | 1,436,429 |
Weighted average grant date fair value |  |  |
Weighted average grant date fair value, Non-vested Options at beginning of period (in dollars per share) | $ 1.68 |  |
Weighted average grant date fair value, Non-vested Options, Granted (in dollars per share) | 4.57 | $ 2.40 | $ 1.82
Weighted average grant date fair value, Non-vested Options, Vested (in dollars per share) | 1.90 |  |
Weighted average grant date fair value, Non-vested Options, Forfeited (in dollars per share) | 2.31 |  |
Weighted average grant date fair value, Non-vested Options at end of period (in dollars per share) | $ 4.11 | $ 1.68 |

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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=116856206&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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