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Fair Value Measurements Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
The following table summarizes the levels of fair value measurements of our financial assets:
 
March 31, 2020
 
December 31, 2019
(in thousands)
Total
Level 1
Level 2
 
Total
Level 1
Level 2
 
 
 
 
 
 
 
 
Money market funds
$
387,263

$
387,263

$
—

 
$
363,075

$
363,075

$
—

U.S. Treasury bills
18,060

18,060

—

 
34,728

34,728

—

Municipal bonds
6,148

—

6,148

 
—

—

—

Total
$
411,471

$
405,323

$
6,148

 
$
397,803

$
397,803

$
—
Available-for-sale Securities [Table Text Block]
The following is a summary of our available-for-sale marketable securities:
(in thousands)
Amortized Cost
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value
 
 
 
 
 
March 31, 2020
 
 
 
 
U.S. Treasury bills
$
13,290

$
70

$
—

$
13,360

Municipal bonds
6,122

26

—

6,148

Total
$
19,412

$
96

$
—

$
19,508

 
 
 
 
 
December 31, 2019
 
 
 
 
U.S. Treasury bills
$
34,716

$
13

$
(1
)
$
34,728

Total
$
34,716

$
13

$
(1
)
$
34,728
Investments Classified by Contractual Maturity Date [Table Text Block]
As of March 31, 2020, the contractual maturities of our marketable securities were as follows:
(in thousands)
Amortized Cost
Estimated Fair Value
 
 
 
Less than one year
$
19,412

$
19,508

One to five years
—

—

Total
$
19,412

$
19,508