6. FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Jun. 30, 2016

FINANCIAL INSTRUMENTS

Schedule of fair value of financial assets and liabilities measured on a recurring basis

The fair value of financial assets measured on a recurring basis is as follows (in thousands):

			Fair Value Measurements at Reporting Date Using
			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
			Identical Assets		Observable		Unobservable
			and Liabilities		Inputs		Inputs
	June 30, 2016		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds	$	4,914	$	4,914	$	—	$	—
Marketable securities		31,131		—		31,131		—
Total	$	36,045	$	4,914	$	31,131	$	—

			Fair Value Measurements at Reporting Date Using
			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
			Identical Assets		Observable		Unobservable
			and Liabilities		Inputs		Inputs
	March 31, 2016		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds	$	6,611	$	6,611	$	—	$	—
Marketable securities		34,297		—		34,297		—
Total	$	40,908	$	6,611	$	34,297	$	—

Schedule of available-for-sale investments

	June 30, 2016
			Gross		Gross
			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(In thousands)
Short-term investments:
State and municipal obligations	$	1,000	$	—	$	—	$	1,000
Corporate notes		4,265		—		(2)		4,263
Certificates of deposit		11,750		14		—		11,764
Foreign government obligations		2,698		2		—		2,700
Agency bonds		2,000		—		—		2,000
Total short-term investments	$	21,713	$	16	$	(2)	$	21,727
Long-term investments:
Corporate notes	$	558	$	2	$	—	$	560
Certificates of deposit		6,750		30		—		6,780
Foreign government obligations		1,059		1		—		1,060
Agency bonds		1,000		4		—		1,004
Total long-term investments	$	9,367	$	37	$	—	$	9,404

	March 31, 2016
			Gross		Gross
			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(In thousands)
Short-term investments:
State and municipal obligations	$	1,011	$	—	$	—	$	1,011
Corporate notes		5,680		—		(3)		5,677
Agency bonds		2,001		1		—		2,002
Foreign government obligations		2,695		3		—		2,698
Certificates of deposit		11,750		12		—		11,762
Total short-term investments	$	23,137	$	16	$	(3)	$	23,150
Long-term investments:
Corporate notes	$	558	$	1	$	—	$	559
Certificates of deposit		8,500		24		(1)		8,523
Agency bonds		1,000		4		—		1,004
Foreign government obligations		1,060		1		—		1,061
Total long-term investments	$	11,118	$	30	$	(1)	$	11,147

Schedule of contractual maturities of the available-for-sale investments

			Fair
	Cost		Value
	(In thousands)
Maturing within one year	$	21,713	$	21,727
Maturing in one to three years		9,367		9,404
	$	31,080	$	31,131