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STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options outstanding, number of shares (shares) | shares	2,476
Options outstanding - weighted- average remaining life	3 years 6 months
Options outstanding - weighted- average exercise price (usd per share)	$ 1.92
Options exercisable - number of shares exercisable (shares) | shares	2,248
Options Exercisable - weighted-average exercise price (usd per share)	$ 1.92
$0.70 —– $1.11
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	0.70
Exercise price range, upper limit (usd per share)	$ 1.11
Options outstanding, number of shares (shares) | shares	533
Options outstanding - weighted- average remaining life	4 years
Options outstanding - weighted- average exercise price (usd per share)	$ 0.85
Options exercisable - number of shares exercisable (shares) | shares	496
Options Exercisable - weighted-average exercise price (usd per share)	$ 0.85
$1.29 —– $1.29
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	1.29
Exercise price range, upper limit (usd per share)	$ 1.29
Options outstanding, number of shares (shares) | shares	1,000
Options outstanding - weighted- average remaining life	3 years 6 months
Options outstanding - weighted- average exercise price (usd per share)	$ 1.29
Options exercisable - number of shares exercisable (shares) | shares	875
Options Exercisable - weighted-average exercise price (usd per share)	$ 1.29
$1.31 —– $1.31
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	1.31
Exercise price range, upper limit (usd per share)	$ 1.31
Options outstanding, number of shares (shares) | shares	670
Options outstanding - weighted- average remaining life	3 years
Options outstanding - weighted- average exercise price (usd per share)	$ 1.31
Options exercisable - number of shares exercisable (shares) | shares	649
Options Exercisable - weighted-average exercise price (usd per share)	$ 1.31
$1.39 —– $14.58
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	1.39
Exercise price range, upper limit (usd per share)	$ 14.58
Options outstanding, number of shares (shares) | shares	262
Options outstanding - weighted- average remaining life	3 years 8 months 12 days
Options outstanding - weighted- average exercise price (usd per share)	$ 5.52
Options exercisable - number of shares exercisable (shares) | shares	219
Options Exercisable - weighted-average exercise price (usd per share)	$ 6.12
$64.17 —– $64.17
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	64.17
Exercise price range, upper limit (usd per share)	$ 64.17
Options outstanding, number of shares (shares) | shares	11
Options outstanding - weighted- average remaining life	6 years 1 month 6 days
Options outstanding - weighted- average exercise price (usd per share)	$ 64.17
Options exercisable - number of shares exercisable (shares) | shares	9
Options Exercisable - weighted-average exercise price (usd per share)	$ 64.17

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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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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.

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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.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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