STOCKHOLDERS EQUITY AND STOCK-BASED COMPENSATION (Details 5) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	May 31, 2022 USD ($) $ / shares shares
$1.34-$19.85
Options outstanding, ending (in thousands) | shares | shares	1,597
Weighted average remaining contractual life (Years) options outstanding	4 years 1 month 13 days
Weighted average exercise price outstanding, ending | $ / shares	$ 2.70
Option exercisable shares (in thousands) | shares	1,042
Weighted average remaining contractual life (Years) options exercisable	3 years 5 months 19 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.22
Aggregate intrinsic value for options exercisable | | $	$ 6,440
$1.34
Options outstanding, ending (in thousands) | shares | shares	51
Weighted average remaining contractual life (Years) options outstanding	5 years 4 months 20 days
Weighted average exercise price outstanding, ending | $ / shares	$ 1.34
Option exercisable shares (in thousands) | shares	51
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.34
Weighted average remaining contractual life (Years) options exercisable	5 years 4 months 20 days
$1.64-$1.86
Options outstanding, ending (in thousands) | shares | shares	659
Weighted average remaining contractual life (Years) options outstanding	4 years 7 days
Weighted average exercise price outstanding, ending | $ / shares	$ 1.70
Option exercisable shares (in thousands) | shares	419
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.69
Weighted average remaining contractual life (Years) options exercisable	3 years 8 months 15 days
$2.03-$2.42
Options outstanding, ending (in thousands) | shares | shares	471
Weighted average remaining contractual life (Years) options outstanding	3 years 3 months 29 days
Weighted average exercise price outstanding, ending | $ / shares	$ 2.25
Option exercisable shares (in thousands) | shares	408
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.26
Weighted average remaining contractual life (Years) options exercisable	3 years 2 months 15 days
$2.76-$2.93
Options outstanding, ending (in thousands) | shares | shares	215
Weighted average remaining contractual life (Years) options outstanding	5 years 7 months 6 days
Weighted average exercise price outstanding, ending | $ / shares	$ 2.91
Option exercisable shares (in thousands) | shares	56
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.87
Weighted average remaining contractual life (Years) options exercisable	4 years 1 month 13 days
$3.46-$3.93
Options outstanding, ending (in thousands) | shares | shares	104
Weighted average remaining contractual life (Years) options outstanding	2 years 2 months 1 day
Weighted average exercise price outstanding, ending | $ / shares	$ 3.84
Option exercisable shares (in thousands) | shares	104
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 3.84
Weighted average remaining contractual life (Years) options exercisable	2 years 2 months 1 day
$9.45-$19.85
Options outstanding, ending (in thousands) | shares | shares	97
Weighted average remaining contractual life (Years) options outstanding	6 years 9 months 18 days
Weighted average exercise price outstanding, ending | $ / shares	$ 10.57
Option exercisable shares (in thousands) | shares	4
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 14.02
Weighted average remaining contractual options exercisable	6 years 7 months 20 days