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11. STOCK-BASED COMPENSATION - Options outstanding by exercise price (Details) - $ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Options outstanding by exercise price
Exercise Price (in dollars per share)	$ 6.17	$ 6.17	$ 5.77	$ 5.45
Number of Shares Underlying Options Outstanding (in shares)	8,432,877
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.17
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 7 months 17 days
Options Exercisable, Number Vested and Exercisable (in shares)	5,234,179
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.63
$3.40 - $4.81
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	3.40
Exercise Price, high end of range (in dollars per share)	$ 4.81
Number of Shares Underlying Options Outstanding (in shares)	876,282
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.06
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 1 month 2 days
Options Exercisable, Number Vested and Exercisable (in shares)	876,282
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.06
$4.90 - $4.99
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	4.90
Exercise Price, high end of range (in dollars per share)	$ 4.99
Number of Shares Underlying Options Outstanding (in shares)	1,218,701
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.97
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 3 months 26 days
Options Exercisable, Number Vested and Exercisable (in shares)	1,218,701
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.97
$5.13 - $5.59
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)	$ 5.59
Number of Shares Underlying Options Outstanding (in shares)	902,534
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.32
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 5 months 5 days
Options Exercisable, Number Vested and Exercisable (in shares)	902,534
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.32
$5.69 - $5.83
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	5.69
Exercise Price, high end of range (in dollars per share)	$ 5.83
Number of Shares Underlying Options Outstanding (in shares)	854,167
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.81
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 1 month 10 days
Options Exercisable, Number Vested and Exercisable (in shares)	270,474
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.76
$5.91 - $6.45
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)	$ 6.45
Number of Shares Underlying Options Outstanding (in shares)	874,207
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.16
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 1 month 6 days
Options Exercisable, Number Vested and Exercisable (in shares)	521,676
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.19
$6.54 - $6.70
Options outstanding by exercise price
Exercise Price, low end of range (in dollars per share)	6.54
Exercise Price, high end of range (in dollars per share)	$ 6.70
Number of Shares Underlying Options Outstanding (in shares)	999,805
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.66
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 4 months 13 days
Options Exercisable, Number Vested and Exercisable (in shares)	454,858
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.61
$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)	1,036,947
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 7.08
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 3 months 18 days
Options Exercisable, Number Vested and Exercisable (in shares)	557,923
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.95
$7.40 - $8.06
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)	$ 8.06
Number of Shares Underlying Options Outstanding (in shares)	973,981
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 7.68
Options Outstanding, Weighted Average Remaining Contractual Life	8 years 8 months 1 day
Options Exercisable, Number Vested and Exercisable (in shares)	324,101
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 7.68
$8.09
Options outstanding by exercise price
Exercise Price (in dollars per share)	$ 8.09
Number of Shares Underlying Options Outstanding (in shares)	82,360
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.09
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 9 months 29 days
Options Exercisable, Number Vested and Exercisable (in shares)	61,657
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)	613,893
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.30
Options Outstanding, Weighted Average Remaining Contractual Life	8 years 3 months 29 days
Options Exercisable, Number Vested and Exercisable (in shares)	45,973
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.30

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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