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STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options outstanding, number of shares (shares) | shares	2,264
Options outstanding - weighted- average remaining life	2 years 9 months 18 days
Options outstanding - weighted- average exercise price (usd per share)	$ 1.90
Options exercisable - number of shares exercisable (shares) | shares	2,262
Options exercisable - weighted-average exercise price (usd per share)	$ 1.90
$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	486
Options outstanding - weighted- average remaining life	3 years 3 months 18 days
Options outstanding - weighted- average exercise price (usd per share)	$ 0.86
Options exercisable - number of shares exercisable (shares) | shares	486
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	2 years 8 months 12 days
Options outstanding - weighted- average exercise price (usd per share)	$ 1.29
Options exercisable - number of shares exercisable (shares) | shares	1,000
Options exercisable - weighted-average exercise price (usd per share)	$ 1.28
$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	556
Options outstanding - weighted- average remaining life	2 years 3 months 18 days
Options outstanding - weighted- average exercise price (usd per share)	$ 1.31
Options exercisable - number of shares exercisable (shares) | shares	556
Options exercisable - weighted-average exercise price (usd per share)	$ 1.31
$1.53 —– $14.58
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	1.53
Exercise price range, upper limit (usd per share)	$ 14.58
Options outstanding, number of shares (shares) | shares	211
Options outstanding - weighted- average remaining life	3 years 1 month 6 days
Options outstanding - weighted- average exercise price (usd per share)	$ 5.65
Options exercisable - number of shares exercisable (shares) | shares	209
Options exercisable - weighted-average exercise price (usd per share)	$ 5.65
$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	5 years 4 months 24 days
Options outstanding - weighted- average exercise price (usd per share)	$ 64.17
Options exercisable - number of shares exercisable (shares) | shares	11
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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