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3. NET INCOME (LOSS) PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net income (loss)									$ (21,505)	$ (10,337)	$ 163
Weighted average shares - Basic									23,671	22,968	21,889
Weighted average shares - Dilutive									23,671	22,968	23,349
Net income (loss) per common share - Basic	$ (0.21)	$ (0.22)	$ (0.22)	$ (0.26)	$ (0.16)	$ (0.20)	$ (0.08)	$ (0.01)	$ (0.91)	$ (0.45)	$ 0.01
Net income (loss) per common share - Diluted	$ (0.21)	$ (0.22)	$ (0.22)	$ (0.26)	$ (0.16)	$ (0.20)	$ (0.08)	$ (0.01)	$ (0.91)	$ (0.45)	$ 0.01
Employee stock options
Dilutive effect of options											1,453
Employee stock purchase plan options
Dilutive effect of options											7

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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