| Schedule of assets measured at fair value on a recurring basis |
|
Description
|
|
Carrying
value at
September 30,
2020
|
|
Gross
Unrealized
Holding
Gains
|
|
Quoted Price
Prices in
Active Markets
(Level 1)
|
|
Money market fund
|
|
$
|
306,566,000
|
|
$
|
—
|
|
$
|
306,566,000
|
|
Description
|
|
Carrying
value at
December 31,
2019
|
|
Gross
Unrealized
Holding
Gains
|
|
Quoted Price
Prices in
Active Markets
(Level 1)
|
|
Cash and money market funds
|
|
$
|
11,000
|
|
$
|
—
|
|
$
|
11,000
|
|
U.S. government treasury bills
|
|
|
307,327,000
|
|
|
6,000
|
|
|
307,333,000
|
|
Total
|
|
$
|
307,338,000
|
|
$
|
6,000
|
|
$
|
307,344,000
|
|
|
Description
|
|
Carrying
value at
December 31,
2019
|
|
Gross
Unrealized
Holding
Gains
|
|
Quoted Price
Prices in
Active Markets
(Level 1)
|
|
Assets:
|
|
|
|
|
|
|
|
|
|
|
Cash and money market funds
|
|
$
|
11,000
|
|
$
|
—
|
|
$
|
11,000
|
|
U.S. government treasury bills
|
|
|
307,327,000
|
|
|
6,000
|
|
|
307,333,000
|
|
Total
|
|
$
|
307,338,000
|
|
$
|
6,000
|
|
$
|
307,344,000
|
|