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STOCK-BASED COMPENSATION PLANS - Stock Plan (Details) shares in Thousands	12 Months Ended
	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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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.

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