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Fair Value of Financial Insturments (Tables)
 6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy as of June 30, 2020 and December 31, 2019, are summarized as follows (in thousands):
 
June 30, 2020
 
December 31, 2019
 
Level 1
Level 2
Total
 
Level 1
Level 2
Total
Assets
 
 
 
 
 
 
 
Money market funds
$
6,682

$
—

$
6,682

 
$
4,086

$
—

$
4,086

Commercial paper
—

15,987

15,987

 
—

12,854

12,854

U.S. government agency securities
—

—

—

 
—

3,000

3,000

Corporate debt securities
—

188,489

188,489

 
—

188,310

188,310

Total assets measured at fair value
$
6,682

$
204,476

$
211,158

 
$
4,086

$
204,164

$
208,250