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STOCK-BASED COMPENSATION PLANS - Summary of our unvested stock options (Details) - Non vested Share Awards [Member] - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Non-vested Shares Under Option, Beginning Balance | 569 | 658
Non-vested Shares Under Option, Granted | 653 | 215
Non-vested Shares Under Option, Vested | (169) | (256)
Non-vested Shares Under Option, Forfeited | (163) | (48)
Non-vested Shares Under Option, Ending Balance | 890 | 569
Weighted Average Grant Date Fair Value, Beginning Balance | $ 1.44 | $ 0.81
Weighted Average Grant Date Fair Value, Granted | 5.12 | 2.65
Weighted Average Grant Date Fair Value, Vested | 1.24 | 0.72
Weighted Average Grant Date Fair Value, Forfeited | 2.44 | 1.98
Weighted Average Grant Date Fair Value, Ending Balance | $ 4.03 | $ 1.44

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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 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 Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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- Details
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