FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Of Marketable Securities and Investments [Table Text Block]

The fair value hierarchy of the Company’s cash equivalents and marketable securities at December 31, 2016, and December 31, 2015, was as follows:

	Fair Value Measurement at
	December 31, 2016
(in thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Commercial paper	$	58,031	$	—	$	58,031
Money market funds	1,916		1,916		—
Corporate securities	132,141		—		132,141
Total	$	192,088	$	1,916	$	190,172

	Fair Value Measurement at
	December 31, 2015
(in thousands)	Total Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Commercial paper	$	21,194	$	—	$	21,194
Money market funds	104		104		—
Corporate securities	83,769		—		83,769
Total	$	105,067	$	104	$	104,963