SHARE BASED COMPENSATION - Summary of stock option outstanding (Details) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Shares (In thousands)
Balance at the beginning (in shares)	11,253
Options granted (in shares)	0
Options exercised (in shares)	(1,721)
Options forfeited or expired (in shares)	(2)
Options cancelled (in shares)	(1)
Balance at the end (in shares)	9,529	11,253
Vested and exercisable at the end ( in shares)	7,064
Exercise Price Per Share
Granted (in dollars per share)	$ 0
Forfeited or expired (in dollars per share)	1.06
Cancelled (in dollars per share)	1.06
Exercise Price Per Share
Weighted average exercise price, balance at the beginning (in dollars per share)	0.51
Weighted average exercise price, granted (in dollars per share)	0
Weighted average exercise price, exercised (in dollars per share)	0.30
Weighted average exercise price, forfeited or expired (in dollars per share)	1.06
Weighted average exercise price, cancelled (in dollars per share)	1.06
Weighted average exercise price, balance at the end (in dollars per share)	0.56	$ 0.51
Weighted average exercise price, vested and exercisable at the end (in dollars per share)	$ 0.40
Weighted-Average Remaining Contractual Term (In years)
Weighted average remaining contractual term (in years)	7 years 21 days	6 years 9 months 18 days
Weighted average remaining contractual term, vested and exercisable options (in years)	6 years 6 months 21 days
Per Share Average Intrinsic Value
Per share intrinsic value, outstanding balance at the beginning (in dollars per share)	$ 9.75
Granted (in dollars per share)	0
Exercised (in dollars per share)	9.98
Forfeited or expired (in dollars per share)	9.22
Cancelled (in dollars per share)	9.22
Weighted-average issuance price , outstanding balance at the end (in dollars per share)	9.72	$ 9.75
Vested and exercisable (in dollars per share)	9.88
Minimum
Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)	0.08
Exercised (in dollars per share)	0.08
Outstanding, ending balance (in dollars per share)	0.08	0.08
Vested and exercisable (in dollars per share)	0.08
Maximum
Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)	1.06
Exercised (in dollars per share)	1.06
Outstanding, ending balance (in dollars per share)	1.06	$ 1.06
Vested and exercisable (in dollars per share)	$ 1.06