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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, and 2018, was as follows:
 
Fair Value Measurement at
 
December 31, 2019
(in thousands)
Total Fair Value
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Other Observable Inputs
(Level 2)
Corporate securities
$
232,398

 
$
—

 
$
232,398

Commercial paper
146,955

 
—

 
146,955

Money market funds
2,983

 
2,983

 
—

     Total
$
382,336

 
$
2,983

 
$
379,353

 
Fair Value Measurement at
 
December 31, 2018
(in thousands)
Total Fair Value
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Other Observable Inputs
(Level 2)
Corporate securities
$
94,451

 
$
—

 
$
94,451

Commercial paper
96,366

 
—

 
96,366

Money market funds
304

 
304

 
—

     Total
$
191,121

 
$
304

 
$
190,817