STOCKHOLDERS' EQUITY: - Summary of Options (Details)	12 Months Ended
	Mar. 31, 2020 $ / shares shares
Stock options outstanding and exercisable by exercise price range
Options outstanding (in shares) | shares	1,350,658
Options outstanding - Weighted-average remaining contractual life	3 years 7 months 6 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 14.43
Options exercisable (in shares) | shares	1,262,493
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 15.32
Range of exercise price per share from $0.61 to $9.99
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	0.61
Exercise price per share, high end of range (in dollars per share)	$ 9.99
Options outstanding (in shares) | shares	233,296
Options outstanding - Weighted-average remaining contractual life	5 years 4 months 24 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 1.60
Options exercisable (in shares) | shares	145,131
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 1.51
Range of exercise price per share from $10.00 to $19.99
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	10.00
Exercise price per share, high end of range (in dollars per share)	$ 19.99
Options outstanding (in shares) | shares	709,672
Options outstanding - Weighted-average remaining contractual life	2 years 7 months 6 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 14.69
Options exercisable (in shares) | shares	709,672
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 14.69
Range of exercise price per share from $20.00 to $24.99
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	20.00
Exercise price per share, high end of range (in dollars per share)	$ 24.99
Options outstanding (in shares) | shares	407,690
Options outstanding - Weighted-average remaining contractual life	4 years 3 months 18 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 21.31
Options exercisable (in shares) | shares	407,690
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 21.31