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10. STOCK-BASED COMPENSATION - Stock option activities (Details)
 9 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
STOCK-BASED COMPENSATION  
Shares available for grant, Beginning 1,331,562
Options reserved (in shares) 4,000,000
Granted (in shares) (1,081,951)
Forfeited (in shares) 239,287
Shares available for grant, Ending 4,488,898
Number of Shares Underlying Options Outstanding  
Balance at the beginning of the period (in shares) 8,432,877
Granted (in shares) 1,081,951
Exercised (in shares) (313,097)
Forfeited (in shares) (526,604)
Balance at the end of the period (in shares) 8,675,127
Options vested and exercisable (in shares) 5,453,751
Options vested and expected to vest (in shares) 8,569,093
Weighted Average Remaining Contractual Life  
Options weighted average remaining contractual life 5 years 8 months 4 days
Options vested and expected to vest 5 years 7 months 20 days
Options vested and exercisable 4 years 21 days
Weighted Average Exercise Price  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 6.17
Granted (in dollars per share) | $ / shares 5.61
Exercised (in dollars per share) | $ / shares 5.13
Forfeited (in dollars per share) | $ / shares 6.62
Balance at the end of the period (in dollars per share) | $ / shares 6.11
Options vested and exercisable (in dollars per share) | $ / shares 5.84
Options vested and expected to vest (in dollars per share) | $ / shares $ 6.11
Intrinsic Value  
Exercised (in dollars) | $ $ 149,121
Options vested and exercisable (in dollars) | $ 516,592
Options vested and expected to vest (in dollars) | $ $ 516,592