FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair value of marketable securities and investments [Table Text Block]

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

	Fair Value Measurement at
	March 31, 2014
Description	March 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Commercial paper	$	3,723	$	—	$	3,723
Money market funds	17,516		17,516		—
Corporate securities	133,684		—		133,684
Total	$	154,923	$	17,516	$	137,407

	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