v3.10.0.1
Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments Classified as Available-For-Sale
Marketable securities classified as available-for-sale as of September 30, 2018 and December 31, 2017 were comprised of (in thousands):
 
 
 
September 30, 2018
 
 
December 31, 2017
 
 
 
Amortized

Cost
 
 
Gross

Unrealized

Gains
 
 
Gross

Unrealized

Losses
 
 
Fair Value
 
 
Amortized

Cost
 
 
Gross

Unrealized
Gains
 
 
Gross

Unrealized

Losses
 
 
Fair Value
 
Asset-backed  securities
 
$
4,990
 
 
$
—
 
 
$
(1
)
 
$
4,989
 
 
$
13,748
 
 
$
—
 
 
$
(5
)
 
$
13,743
 
Corporate debt securities
 
 
65,630
 
 
 
1
 
 
 
(8
)
 
 
65,623
 
 
 
37,265
 
 
 
—
 
 
 
(12
)
 
 
37,253
 
Total
 
$
70,620
 
 
$
1
 
 
$
(9
)
 
$
70,612
 
 
$
51,013
 
 
$
—
 
 
$
(17
)
 
$
50,996