FAIR VALUE DISCLOSURE (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Assets measured at fair value

The Company’s assets that were measured at fair value by level within the fair value hierarchy were as follows (in thousands):

	December 31, 2014
	Fair Value		Level 1		Level 2		Level 3
Assets
Cash equivalents:
Money market funds	$	2,771	$	2,771	$	—	$	—
Corporate debt securities	3,000		—		3,000		—
Short-term investments:
Corporate debt securities	118,323		—		118,323		—
U.S government agency securities	24,383		—		24,383		—
Total assets measured and recorded at fair value	$	148,477	$	2,771	$	145,706	$	—

	December 31, 2013
	Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents:
Money market funds	$	47,773	$	47,773	$	—	$	—
Short-term investments:
Corporate debt securities	60,878		—		60,878		—
Total assets measured and recorded at fair value	$	108,651	$	47,773	$	60,878	$	—