FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair value of marketable securities and investments

The fair-value hierarchy of the Company's marketable securities at June 30, 2015, and December 31, 2014, was as follows (in thousands):

	Fair Value Measurement at
	June 30, 2015
	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Commercial paper	$	42,472	$	—	$	42,472
Money market funds	3,554		3,554		—
Corporate securities	87,456		—		87,456
Total	$	133,482	$	3,554	$	129,928

	Fair Value Measurement at
	December 31, 2014
	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Money market funds	$	3,370	$	3,370	$	—
Corporate securities	114,575		—		114,575
Total	$	117,945	$	3,370	$	114,575