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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Included in cash and cash equivalents
Amortized Cost	$ 5,997	$ 18,796
Gross Unrealized Losses		(1)
Estimated Fair Value	5,997	18,795
Restricted cash
Amortized Cost	795	794
Estimated Fair Value	795	794
Marketable securities
Amortized Cost	56,629	73,431
Gross Unrealized Gains	10	48
Gross Unrealized Losses	(22)	(7)
Estimated Fair Value	56,617	73,472
Money market funds
Included in cash and cash equivalents
Amortized Cost	5,997	15,660
Estimated Fair Value	5,997	15,660
Certificates of deposit
Restricted cash
Amortized Cost	795	794
Estimated Fair Value	795	794
Government-sponsored enterprise securities
Marketable securities
Amortized Cost	7,319	8,618
Gross Unrealized Gains	1	5
Estimated Fair Value	7,320	8,623
Commercial paper
Marketable securities
Amortized Cost	15,741	20,623
Gross Unrealized Gains	9	21
Estimated Fair Value	15,750	20,644
Corporate notes
Included in cash and cash equivalents
Amortized Cost		3,136
Gross Unrealized Losses		(1)
Estimated Fair Value		3,135
Marketable securities
Amortized Cost	33,569	44,190
Gross Unrealized Gains		22
Gross Unrealized Losses	(22)	(7)
Estimated Fair Value	$ 33,547	$ 44,205

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Amount of gross unrealized gains from available-for-sale securities as of the reporting date.

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

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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The aggregate value of all restricted investments.

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