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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Included in cash and cash equivalents
Amortized Cost	$ 13,133	$ 40,342
Estimated Fair Value	13,133	40,342
Restricted cash
Amortized Cost	266	266
Estimated Fair Value	266	266
Marketable securities
Amortized Cost	140,998	127,661
Gross Unrealized Gains	34	16
Gross Unrealized Losses	(84)	(100)
Estimated Fair Value	140,948	127,577
Money market funds
Included in cash and cash equivalents
Amortized Cost	13,133	40,342
Estimated Fair Value	13,133	40,342
Certificates of deposit
Restricted cash
Amortized Cost	266	266
Estimated Fair Value	266	266
Government-sponsored enterprise securities (due in less than 1 year)
Marketable securities
Amortized Cost	400	401
Gross Unrealized Losses		(1)
Estimated Fair Value	400	400
Government-sponsored enterprise securities (due in 1 to 2 years)
Marketable securities
Amortized Cost	6,924	6,556
Gross Unrealized Gains	1
Gross Unrealized Losses	(3)	(7)
Estimated Fair Value	6,922	6,549
Commercial paper (due in less than 1 year)
Marketable securities
Amortized Cost	21,728	10,985
Gross Unrealized Gains	20	14
Estimated Fair Value	21,748	10,999
Corporate notes (due in less than 1 year)
Marketable securities
Amortized Cost	100,110	97,307
Gross Unrealized Gains	12	2
Gross Unrealized Losses	(56)	(63)
Estimated Fair Value	100,066	97,246
Corporate notes (due in 1 to 2 years)
Marketable securities
Amortized Cost	11,836	12,412
Gross Unrealized Gains	1
Gross Unrealized Losses	(25)	(29)
Estimated Fair Value	$ 11,812	$ 12,383

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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