FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Fair value of marketable securities and investments

The fair-value hierarchy of the Company's marketable securities at June 30, 2014, and December 31, 2013, was as follows (in thousands):

	Fair Value Measurement at
	June 30, 2014
Description	June 30, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Commercial paper	$	500	$	—	$	500
Money market funds	17,554		17,554		—
Corporate securities	133,354		—		133,354
Total	$	151,408	$	17,554	$	133,854

	Fair Value Measurement at
	December 31, 2013
Description	December 31, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Commercial paper	$	3,099	$	—	$	3,099
Money market funds	17,492		17,492		—
Corporate securities	109,179		—		109,179
Total	$	129,770	$	17,492	$	112,278