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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Included in cash and cash equivalents
Amortized Cost	$ 14,697	$ 40,342
Estimated Fair Value	14,697	40,342
Restricted cash
Amortized Cost	266	266
Estimated Fair Value	266	266
Marketable securities
Amortized Cost	134,735	127,661
Gross Unrealized Gains	24	16
Gross Unrealized Losses	(81)	(100)
Estimated Fair Value	134,678	127,577
Money market funds
Included in cash and cash equivalents
Amortized Cost	13,190	40,342
Estimated Fair Value	13,190	40,342
Corporate notes
Included in cash and cash equivalents
Amortized Cost	1,507
Estimated Fair Value	1,507
Certificate 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		401
Gross Unrealized Losses		(1)
Estimated Fair Value		400
Government-sponsored enterprise securities (due in 1 to 2 years)
Marketable securities
Amortized Cost	6,921	6,556
Gross Unrealized Gains	1
Gross Unrealized Losses		(7)
Estimated Fair Value	6,922	6,549
Commercial paper (due in less than 1 year)
Marketable securities
Amortized Cost	22,238	10,985
Gross Unrealized Gains	12	14
Estimated Fair Value	22,250	10,999
Corporate notes (due in less than 1 year)
Marketable securities
Amortized Cost	80,634	97,307
Gross Unrealized Gains	7	2
Gross Unrealized Losses	(34)	(63)
Estimated Fair Value	80,607	97,246
Corporate notes (due in 1 to 2 years)
Marketable securities
Amortized Cost	24,942	12,412
Gross Unrealized Gains	4
Gross Unrealized Losses	(47)	(29)
Estimated Fair Value	$ 24,899	$ 12,383

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