FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2013

FAIR VALUE MEASUREMENTS

Schedule of information about assets that are measured at fair value on a recurring basis

	Fair value measurements at reporting date using
	Quoted prices in						Significant
	active markets for			Significant other			unobservable
	identical assets			observable inputs			inputs			Balance as of
Description	(Level 1)			(Level 2)			(Level 3)			March 31, 2013
Cash equivalents:
Money Market funds	$	17,649		$	—		$	—		$	17,649
Short-term investments:
Government securities	—			17,197			—			17,197
Total	$	17,649		$	17,197		$	—		$	34,846
	Fair value measurements at reporting date using
	Quoted prices in active						Significant
	markets for identical			Significant other			unobservable
	assets			observable inputs			inputs			Balance as of
Description	(Level 1)			(Level 2)			(Level 3)			December 31, 2012
Cash equivalents:
Money market funds	$		11,157	$		—	$		—	$		11,157
Government securities	—			2,015			—			2,015
Short-term investments:
Government securities	—			29,201			—			29,201
Long-term investments:
Government securities	—			2,508			—			2,508
Total	$		11,157	$		33,724	$		—	$		44,881