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Cash Equivalents and Investments in Marketable Securities
 12 Months Ended
Dec. 31, 2019
Cash and Cash Equivalents [Abstract]  
Cash Equivalents and Investments in Marketable Securities
Cash Equivalents and Investments in Marketable Securities
The Company did not hold any cash equivalents and investments in marketable securities as of December 31, 2019.
The following table summarizes the Company’s cash equivalents and investments in marketable securities measured at fair value on a recurring basis as of December 31, 2018:
 
 
 
Fair value Measurements
 
Total
 
Quoted prices in active market
Level 1
 
Significant other observable inputs
Level 2
 
Significant unobservable inputs
Level 3
 
(in thousands)
Money market funds
$
4,830

 
$
4,830

 
$
—

 
$
—

Commercial paper
1,497

 
—

 
1,497

 
—

Corporate notes and bonds
6,989

 
—

 
6,989

 
—

U.S. treasuries
8,375

 
8,375

 
—

 
—

Total
$
21,691

 
$
13,205

 
$
8,486

 
$
—

 
 
 
 
Classified as:
 
 
 
Cash equivalents
$
7,829

 
 
Marketable securities at fair value
13,862

 
 
Total
$
21,691

 
 

The Company did not transfer any marketable securities measured at fair value on a recurring basis to or from Level 1 and Level 2 during the years ended December 31, 2019 and 2018.
The following table summarizes the unrealized positions for available-for-sale fixed-maturity debt securities disaggregated by class of instrument as of December 31, 2018:
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
(in thousands)
Money market funds
$
4,830

 
$
—

 
$
—

 
$
4,830

Commercial paper
1,497

 
—

 
—

 
1,497

Corporate notes and bonds
6,994

 
—

 
(5
)
 
6,989

U.S. treasuries
8,375

 
—

 
—

 
8,375

Total
$
21,696

 
$
—

 
$
(5
)
 
$
21,691