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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Amortized Costs	$ 169,793		$ 163,005
Gross Unrealized Gains	151		89
Gross Unrealized Loss	(200)		(244)
Estimated Fair Value	169,744		162,850
Cash and cash equivalents	32,094		33,576	$ 28,795		$ 53,110
Short-term marketable investments	137,650		129,274
Liabilities, Fair Value Disclosure	216	$ 216	341	$ 241	$ 391	$ 0
Aavailable-for-sale investments due within one year	83,100
Aavailable-for-sale investments due after one year	54,550
Level 1
Amortized Costs	34,094		35,576
Gross Unrealized Gains	0		0
Gross Unrealized Loss	(169)		(187)
Estimated Fair Value	33,925		35,389
Cash and cash equivalents	32,094		33,576
Short-term marketable investments	1,831		1,813
Level 2
Amortized Costs	135,699		127,429
Gross Unrealized Gains	151		89
Gross Unrealized Loss	(31)		(57)
Estimated Fair Value	135,819		127,461
Cash and cash equivalents	0		0
Short-term marketable investments	135,819		127,461
Level 3
Amortized Costs	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Loss	0		0
Estimated Fair Value	216		341
Cash and cash equivalents	0		0
Short-term marketable investments	0		0
Liabilities, Fair Value Disclosure	216		341
Cash
Amortized Costs	24,564		18,596
Gross Unrealized Gains	0		0
Gross Unrealized Loss	0		0
Estimated Fair Value	24,564		18,596
Cash and cash equivalents	24,564		18,596
Short-term marketable investments	0		0
Money Market Funds | Level 1
Amortized Costs	7,530		14,980
Gross Unrealized Gains	0		0
Gross Unrealized Loss	0		0
Estimated Fair Value	7,530		14,980
Cash and cash equivalents	7,530		14,980
Short-term marketable investments	0		0
Mutual Funds | Level 1
Amortized Costs	2,000		2,000
Gross Unrealized Gains	0		0
Gross Unrealized Loss	(169)		(187)
Estimated Fair Value	1,831		1,813
Cash and cash equivalents	0		0
Short-term marketable investments	1,831		1,813
Commercial Paper | Level 2
Amortized Costs	15,578		6,794
Gross Unrealized Gains	6		2
Gross Unrealized Loss	0		0
Estimated Fair Value	15,584		6,796
Cash and cash equivalents	0		0
Short-term marketable investments	15,584		6,796
Corporate Debt | Level 2
Amortized Costs	91,244		85,164
Gross Unrealized Gains	116		78
Gross Unrealized Loss	(16)		(28)
Estimated Fair Value	91,344		85,214
Cash and cash equivalents	0		0
Short-term marketable investments	91,344		85,214
Municipal Securities | Level 2
Amortized Costs			1,007
Gross Unrealized Gains			0
Gross Unrealized Loss			(1)
Estimated Fair Value			1,006
Cash and cash equivalents			0
Short-term marketable investments			1,006
Asset-backed Securities | Level 2
Amortized Costs	24,063		24,614
Gross Unrealized Gains	26		7
Gross Unrealized Loss	(1)		(11)
Estimated Fair Value	24,088		24,610
Cash and cash equivalents	0		0
Short-term marketable investments	24,088		24,610
Mortgage backed Securities | Level 2
Amortized Costs	1,814		2,045
Gross Unrealized Gains	0		0
Gross Unrealized Loss	(14)		(17)
Estimated Fair Value	1,800		2,028
Cash and cash equivalents	0		0
Short-term marketable investments	1,800		2,028
Agency Bond | Level 2
Amortized Costs	2,000		6,805
Gross Unrealized Gains	2		1
Gross Unrealized Loss	0		0
Estimated Fair Value	2,002		6,806
Cash and cash equivalents	0		0
Short-term marketable investments	2,002		6,806
International Government Securities | Level 2
Amortized Costs	1,000		1,000
Gross Unrealized Gains	1		1
Gross Unrealized Loss	0		0
Estimated Fair Value	1,001		1,001
Cash and cash equivalents	0		0
Short-term marketable investments	1,001		1,001
Contingent Consideration | Level 3
Amortized Costs	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Loss	0		0
Estimated Fair Value	216		341
Cash and cash equivalents	0		0
Short-term marketable investments	0		0
Liabilities, Fair Value Disclosure	$ 216		$ 341

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