FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value

The Company’s assets and liabilities measured at fair value on a recurring basis were:

	December 31, 2018
(in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	10,155	$	10,000	$	—	$	20,155
Marketable securities:
Municipal bonds	$	—	$	44,705	$	—	$	44,705
Corporate bonds	—		48,296		—		48,296
Total marketable securities	$	—	$	93,001	$	—	$	93,001
Investments in privately-held companies (1)	$	—	$	—	$	3,390	$	3,390

⁽¹⁾ Included in other long-term assets.

	December 31, 2017
(in thousands)	Level 1		Level 2		Level 3		Total
Cash equivalents	$	2,720	$	40,051	$	—	$	42,771
Marketable securities:
Municipal bonds	$	—	$	32,848	$	—	$	32,848
Corporate bonds	—		28,621		—		28,621
Total marketable securities	$	—	$	61,469	$	—	$	61,469
Investments in privately-held companies (1)	$	—	$	—	$	1,030	$	1,030

⁽¹⁾ Included in other long-term assets.