6. FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Sep. 30, 2017

FINANCIAL INSTRUMENTS

Schedule of fair value of financial assets 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
	September 30, 2017		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds	$	8,801	$	8,801	$	—	$	—
Marketable securities		26,799		—		26,799		—
Total	$	35,600	$	8,801	$	26,799	$	—

			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, 2017		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds	$	6,293	$	6,293	$	—	$	—
Marketable securities		29,097		—		29,097		—
Total	$	35,390	$	6,293	$	29,097	$	—

Schedule of available-for-sale investments

	September 30, 2017
			Gross		Gross
			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(In thousands)
Short-term investments:
Corporate notes	$	556	$	—	$	(1)	$	555
Certificates of deposit		7,000		2		(7)		6,995
Foreign government obligations		1,053		—		(3)		1,050
State and municipal obligations		1,601		—		—		1,601
Agency bonds		2,005		—		(3)		2,002
Total short-term investments	$	12,215	$	2	$	(14)	$	12,203
Long-term investments:
Certificates of deposit	$	10,250	$	1	$	(35)	$	10,216
Foreign government obligations		4,382		1		(3)		4,380
Total long-term investments	$	14,632	$	2	$	(38)	$	14,596

	March 31, 2017
			Gross		Gross
			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(In thousands)
Short-term investments:
State and municipal obligations	$	1,632	$	1	$	—	$	1,633
Corporate notes		557		—		(2)		555
Agency bonds		3,012		—		(7)		3,005
Foreign government obligations		1,001		—		(1)		1,000
Certificates of deposit		10,000		9		(3)		10,006
Total short-term investments	$	16,202	$	10	$	(13)	$	16,199
Long-term investments:
Certificates of deposit	$	7,500	$	3	$	(39)	$	7,464
Foreign government obligations		5,442		—		(8)		5,434
Total long-term investments	$	12,942	$	3	$	(47)	$	12,898

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

			Fair
	Cost		Value
	(In thousands)
Maturing within one year	$	12,215	$	12,203
Maturing in one to three years		14,632		14,596
	$	26,847	$	26,799