STOCKHOLDERS' EQUITY: - Performance stock option unit activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Stock Option Activity - Number of Shares
Outstanding at beginning of the period (in shares) | shares	1,374,430
Forfeited or cancelled (in shares) | shares	(8,794)
Outstanding at end of the period (in shares) | shares	1,350,658
Exercisable at the end of the period (in shares) | shares	1,262,493
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 14.81
Forfeited or cancelled (in dollars per share) | $ / shares	4.82
Outstanding at the end of the period (in dollars per share) | $ / shares	14.43
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 15.32
Weighted average remaining contractual term	3 years 7 months 6 days
Outstanding at the end of the period | $	$ 24,972
Exercisable at the end of the period | $	$ 22,226
Performance stock
Stock Option Activity - Number of Shares
Outstanding at beginning of the period (in shares) | shares	130,154
Forfeited or cancelled (in shares) | shares	(130,154)
Outstanding at end of the period (in shares) | shares	0
Exercisable at the end of the period (in shares) | shares	0
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 21.44
Forfeited or cancelled (in dollars per share) | $ / shares	21.44
Outstanding at the end of the period (in dollars per share) | $ / shares	0
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 0
Weighted average remaining contractual term
Outstanding at the end of the period | $	$ 0
Exercisable at the end of the period | $	$ 0