|
The following table summarizes the held-to-maturity securities held at December 31, 2019 and 2018 (in thousands):
|
|
|
Amortized
Cost
|
|
|
Unrealized
Gains
|
|
|
Unrealized
Losses
|
|
|
Fair Value
|
|
|
As of December 31, 2019
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S. government securities
|
|
$
|
1,996
|
|
|
$
|
15
|
|
|
$
|
(14
|
)
|
|
$
|
1,997
|
|
|
Commercial paper
|
|
|
998
|
|
|
|
—
|
|
|
|
—
|
|
|
|
998
|
|
|
Overnight repurchase agreement
|
|
|
3,500
|
|
|
|
—
|
|
|
|
—
|
|
|
|
3,500
|
|
|
Total short-term investments
|
|
$
|
6,494
|
|
|
$
|
15
|
|
|
$
|
(14
|
)
|
|
$
|
6,495
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Amortized Cost
|
|
|
Unrealized Gains
|
|
|
Unrealized Losses
|
|
|
Fair Value
|
|
|
As of December 31, 2018
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U.S. government securities
|
|
$
|
14,946
|
|
|
$
|
14
|
|
|
$
|
(15
|
)
|
|
$
|
14,945
|
|
|
Commercial paper
|
|
|
8,772
|
|
|
|
—
|
|
|
|
—
|
|
|
|
8,772
|
|
|
Overnight repurchase agreement
|
|
|
9,000
|
|
|
|
—
|
|
|
|
—
|
|
|
|
9,000
|
|
|
Total short-term investments
|
|
$
|
32,718
|
|
|
$
|
14
|
|
|
$
|
(15
|
)
|
|
$
|
32,717
|
|
|