FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Short-term investments.
Available-for-sale securities
Amortized Cost	$ 24,538	$ 88,629
Gross Unrealized Gains	5	33
Gross Unrealized Losses	(10)	(13)
Fair Value	24,533	88,649
Short-term investments. \| Corporate debentures/bonds
Available-for-sale securities
Amortized Cost	13,823	38,076
Gross Unrealized Gains		9
Gross Unrealized Losses	(10)	(11)
Fair Value	13,813	38,074
Short-term investments. \| Commercial paper
Available-for-sale securities
Amortized Cost		6,193
Fair Value		6,193
Short-term investments. \| Government agency bonds
Available-for-sale securities
Amortized Cost	5,315	26,652
Gross Unrealized Gains	2	10
Gross Unrealized Losses		(2)
Fair Value	5,317	26,660
Short-term investments. \| Treasury bills
Available-for-sale securities
Amortized Cost	5,400	17,708
Gross Unrealized Gains	3	14
Fair Value	5,403	17,722
Cash equivalents
Available-for-sale securities
Amortized Cost	51,784	36,973
Fair Value	51,784	36,973
Cash equivalents \| Money market funds
Available-for-sale securities
Amortized Cost	51,784	33,623
Fair Value	51,784	33,623
Cash equivalents \| Corporate debentures/bonds
Available-for-sale securities
Amortized Cost		3,350
Fair Value		$ 3,350

- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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