FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2012

FAIR VALUE MEASUREMENTS

Schedule of fair value measurements along with the level within the fair value hierarchy in which the fair value measurements fall

			Fair Value Measurement at June 30, 2012 Using:
			Quoted Prices in Active		Significant Other		Significant Unobservable
	Fair Value at		Markets for Identical Assets		Observable Inputs		Inputs
Description	June 30, 2012		(Level 1)		(Level 2)		(Level 3)
Cash equivalents (1)	$	4,283	$	4,283	$	—	$	—
Available-for-Sale
Marketable securities
U.S. governement agency securities		26,958		—		26,958		—
Corporate bonds	28,201		—		28,201		—
Certificates of deposit	8,781		—		8,781		—
Commercial paper	899		—		899		—
Total	$	69,122	$	4,283	$	64,839	$	—

(1)  The $4.3 million of cash equivalents above is included in the cash balance of $6.0 million at June 30, 2012.

			Fair Value Measurement at December 31, 2011 Using:
			Quoted Prices in Active		Significant Other		Significant Unobservable
	Fair Value at		Markets for Identical Assets		Observable Inputs		Inputs
Description	December 31, 2011		(Level 1)		(Level 2)		(Level 3)
Cash equivalents (1)	$	35,385	$	35,385	$	—	$	—
Available-for-Sale
Marketable securities
U.S. government agency securities		27,994		—		27,994		—
Certificates of deposit	9,465		—		9,465		—
Corporate bonds	19,122		—		19,122		—
Commercial paper	999		—		999		—
Total	$	92,965	$	35,385	$	57,580	$	—

(1)  The $35.4 million of cash equivalents above is included in the cash balance of $35.8 million at December 31, 2011.