10. STOCK-BASED COMPENSATION - Options outstanding by exercise price (Details) - $ / shares	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022
Options outstanding by exercise price
Exercise Price (in dollars per share)	$ 6.07	$ 6.07
Number of Shares Underlying Options Outstanding (in shares)	8,206,281
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.07
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 4 months 24 days
Options Exercisable, Number Vested and Exercisable (in shares)	5,654,013
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.98
$3.38 - $4.81
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	3.38
Exercise Price, high end of range (in dollars per share)	$ 4.81
Number of Shares Underlying Options Outstanding (in shares)	907,941
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.02
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 9 months 14 days
Options Exercisable, Number Vested and Exercisable (in shares)	622,971
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.00
$4.98 - $4.99
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	4.98
Exercise Price, high end of range (in dollars per share)	$ 4.99
Number of Shares Underlying Options Outstanding (in shares)	1,024,621
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.99
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 7 months 28 days
Options Exercisable, Number Vested and Exercisable (in shares)	1,024,621
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.99
$5.13 - $5.58
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	5.13
Exercise Price, high end of range (in dollars per share)	$ 5.58
Number of Shares Underlying Options Outstanding (in shares)	1,377,156
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.43
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 2 months 26 days
Options Exercisable, Number Vested and Exercisable (in shares)	658,938
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.27
$5.59 - $5.83
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	5.59
Exercise Price, high end of range (in dollars per share)	$ 5.83
Number of Shares Underlying Options Outstanding (in shares)	1,157,552
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.76
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 3 months 14 days
Options Exercisable, Number Vested and Exercisable (in shares)	566,596
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.71
$5.91 - $6.70
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	5.91
Exercise Price, high end of range (in dollars per share)	$ 6.70
Number of Shares Underlying Options Outstanding (in shares)	1,336,144
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.42
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 5 months 15 days
Options Exercisable, Number Vested and Exercisable (in shares)	1,178,813
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.46
$6.86 - $7.26
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	6.86
Exercise Price, high end of range (in dollars per share)	$ 7.26
Number of Shares Underlying Options Outstanding (in shares)	937,148
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 7.08
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 11 months 1 day
Options Exercisable, Number Vested and Exercisable (in shares)	937,148
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 7.08
$7.40 - $7.88
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	7.40
Exercise Price, high end of range (in dollars per share)	$ 7.88
Number of Shares Underlying Options Outstanding (in shares)	667,706
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 7.62
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 3 months 25 days
Options Exercisable, Number Vested and Exercisable (in shares)	384,743
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 7.64
$8.06
Options outstanding by exercise price
Exercise Price (in dollars per share)	$ 8.06
Number of Shares Underlying Options Outstanding (in shares)	157,210
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.06
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 7 months 6 days
Options Exercisable, Number Vested and Exercisable (in shares)	78,604
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.06
$8.09
Options outstanding by exercise price
Exercise Price (in dollars per share)	$ 8.09
Number of Shares Underlying Options Outstanding (in shares)	82,160
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.09
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 6 months 29 days
Options Exercisable, Number Vested and Exercisable (in shares)	82,160
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.09
$8.30
Options outstanding by exercise price
Exercise Price (in dollars per share)	$ 8.30
Number of Shares Underlying Options Outstanding (in shares)	558,643
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.30
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 21 days
Options Exercisable, Number Vested and Exercisable (in shares)	119,419
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.30