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Investments
 9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Cash, cash equivalents and investments as of September 30, 2019 included the following:
(in thousands)
AMORTIZED
COST
 
GROSS
UNREALIZED
GAINS
 
GROSS
UNREALIZED
LOSSES
 
FAIR
VALUE
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
248,703

 
$
—

 
$
(1
)
 
$
248,702

Total cash and cash equivalents
$
248,703

 
$
—

 
$
(1
)
 
$
248,702

Investments:
 
 
 
 
 
 
 
Commercial paper (due within 1 year)
$
39,551

 
$
—

 
$
(24
)
 
$
39,527

Corporate bonds (due within 1 year)
52,668

 
—

 
(120
)
 
52,548

Corporate bonds (due within 2 years)
5,033

 
—

 
(13
)
 
5,020

Total investments
$
97,252

 
$
—

 
$
(157
)
 
$
97,095

Total cash, cash equivalents and investments
$
345,955

 
$
—

 
$
(158
)
 
$
345,797

Cash and cash equivalents as of December 31, 2018 included the following:
 
 
 
 
GROSS
 
GROSS
 
 
 
 
AMORTIZED
 
UNREALIZED
 
UNREALIZED
 
FAIR
(in thousands)
 
COST
 
GAINS
 
LOSSES
 
VALUE
Cash and cash equivalents:
 
 
 
 
 
 
 
 
Cash and money market funds
 
$
202,818

 
$
—

 
$
—

 
$
202,818

Total cash and cash equivalents
 
$
202,818

 
$
—

 
$
—

 
$
202,818