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7. FINANCIAL INSTRUMENTS (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($) item	Nov. 23, 2015 item
Fair value measurements
Short-term investments	$ 9,196	$ 15,061
Long-term investments	10,126	$ 4,117
Measurement input
Fair value measurements
Discount rate | item		0.145	0.148
Minimum
Fair value measurements
Probability rate		0.00
Maximum
Fair value measurements
Probability rate		0.10
Level 2 | Marketable securities
Fair value measurements
Short-term investments	9,200
Long-term investments	10,100
Other accrued expenses
Fair value measurements
Contingent consideration liability	4,000	$ 3,900
Recurring
Fair value measurements
Assets	42,482	33,295
Liabilities	3,972	3,898
Recurring | Money market funds
Fair value measurements
Money market funds	23,160	14,117
Recurring | Marketable securities
Fair value measurements
Marketable securities	19,322	19,178
Recurring | Level 1
Fair value measurements
Assets	23,160	14,117
Recurring | Level 1 | Money market funds
Fair value measurements
Money market funds	23,160	14,117
Recurring | Level 2
Fair value measurements
Assets	19,322	19,178
Recurring | Level 2 | Marketable securities
Fair value measurements
Marketable securities	19,322	19,178
Recurring | Level 3
Fair value measurements
Liabilities	$ 3,972	$ 3,898

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