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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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