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MARKETABLE SECURITIES
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
MARKETABLE SECURITIES
3. MARKETABLE SECURITIES
(in thousands)
December 31, 2018
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
Municipal bonds
$
44,802

 
$
13

 
$
(110
)
 
$
44,705

Corporate bonds
48,499

 
23

 
(226
)
 
48,296

 
$
93,301

 
$
36

 
$
(336
)
 
$
93,001

(in thousands)
December 31, 2017
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
Municipal bonds
$
32,996

 
$
—

 
$
(148
)
 
$
32,848

Corporate bonds
28,757

 
1

 
(137
)
 
28,621

 
$
61,753

 
$
1

 
$
(285
)
 
$
61,469


As of December 31, 2018, the Company did not hold any investments with unrealized losses considered to be other than temporary.
As of December 31, 2018, remaining maturities of marketable debt securities ranged from January 2019 to August 2021, with a weighted-average remaining maturity of approximately 1.4 years.