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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Summary of Financial Assets Measured at Fair Value on Recurring Basis The following tables summarize our financial assets and liabilities measured at fair value on a recurring basis (in thousands):
 
June 30, 2020
 
(unaudited)
Assets:
Level 1
 
Level 2
 
Level 3
 
Total
Money market funds
$
27,053

 
$
—

 
$
—

 
$
27,053

Corporate debt securities and commercial paper
—

 
1,998

 
—

 
1,998

Total
$
27,053

 
$
1,998

 
$
—

 
$
29,051

 
December 31, 2019
Assets:
Level 1
 
Level 2
 
Level 3
 
Total
Money market funds
$
9,995

 
$
—

 
$
—

 
$
9,995

U.S. treasury bills
5,021

 
—

 
—

 
5,021

Corporate debt securities and commercial paper
—

 
21,876

 
—

 
21,876

Total
$
15,016

 
$
21,876

 
$
—

 
$
36,892