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STOCK-BASED COMPENSATION PLANS - Stock Plan (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2020 $ / shares shares
Outstanding Number of Options (in shares) | shares | 1,006
Weighted average Remaining Contractual Life (years) | 6 years 5 months 19 days
Weighted average Outstanding Strike Price | $ 3.04
Exercisable Number of Options (in shares) | shares | 575
Remaining Exercisable Contractual Life (years) | 5 years 4 months 6 days
Weighted Average Exercisable Strike Price | $ 1.62
Exercise Price Range One [Member] |
Exercise Price Minimum | 0
Exercise Price Maximum | $ 2.00
Outstanding Number of Options (in shares) | shares | 473
Weighted average Remaining Contractual Life (years) | 4 years 7 months 6 days
Weighted average Outstanding Strike Price | $ 0.35
Exercisable Number of Options (in shares) | shares | 401
Remaining Exercisable Contractual Life (years) | 4 years 3 months 10 days
Weighted Average Exercisable Strike Price | $ 0.33
Exercise Price Range Two [Member] |
Exercise Price Minimum | 2.01
Exercise Price Maximum | $ 4.00
Outstanding Number of Options (in shares) | shares | 270
Weighted average Remaining Contractual Life (years) | 7 years 7 months 28 days
Weighted average Outstanding Strike Price | $ 3.05
Exercisable Number of Options (in shares) | shares | 116
Remaining Exercisable Contractual Life (years) | 7 years 5 months 4 days
Weighted Average Exercisable Strike Price | $ 2.87
Exercise Price Range Three [Member] |
Exercise Price Minimum | 4.01
Exercise Price Maximum | $ 6.00
Outstanding Number of Options (in shares) | shares | 19
Weighted average Remaining Contractual Life (years) | 8 years 3 months
Weighted average Outstanding Strike Price | $ 4.45
Remaining Exercisable Contractual Life (years) | 0 years
Exercise Price Range Four [Member] |
Exercise Price Minimum | $ 6.01
Exercise Price Maximum | $ 8.00
Outstanding Number of Options (in shares) | shares | 200
Weighted average Remaining Contractual Life (years) | 8 years 6 months 21 days
Weighted average Outstanding Strike Price | $ 7.87
Exercisable Number of Options (in shares) | shares | 50
Remaining Exercisable Contractual Life (years) | 0 years
Weighted Average Exercisable Strike Price | $ 7.87
Exercise Price Range Five [Member] |
Exercise Price Minimum | 8.01
Exercise Price Maximum | $ 10.00
Outstanding Number of Options (in shares) | shares | 41
Weighted average Remaining Contractual Life (years) | 8 years 11 months 1 day
Weighted average Outstanding Strike Price | $ 9.22
Exercisable Number of Options (in shares) | shares | 8
Remaining Exercisable Contractual Life (years) | 0 years
Weighted Average Exercisable Strike Price | $ 8.98
Exercise Price Range Six [Member] |
Exercise Price Minimum | 10.01
Exercise Price Maximum | $ 12.00
Outstanding Number of Options (in shares) | shares | 3
Weighted average Remaining Contractual Life (years) | 9 years 14 days
Weighted average Outstanding Strike Price | $ 10.60
Remaining Exercisable Contractual Life (years) | 0 years

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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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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