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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Measurements  
Summary of major categories of financial assets and liabilities measured at fair value on a recurring basis

The following fair value hierarchy table presents information about each major category of our financial assets and liabilities measured at fair value on a recurring basis (in thousands):

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Level 1

    

Level 2

    

Level 3

    

Total

 

June 30, 2020

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​

​

​

​

​

​

​

​

​

​

​

​

Assets

​

​

​

​

​

​

​

​

​

​

​

​

​

Money market funds (cash equivalents)

​

$

89,151

​

$

—

​

$

—

​

$

89,151

​

Certificates of deposit

​

​

4,958

​

​

—

​

​

—

​

​

4,958

​

U.S. Treasury securities

​

​

—

​

​

2,008

​

​

—

​

​

2,008

​

Total assets

​

$

94,109

​

$

2,008

​

$

—

​

$

96,117

​

December 31, 2019

​

​

​

​

​

​

​

​

​

​

​

​

​

Assets

​

​

​

​

​

​

​

​

​

​

​

​

​

Money market funds (cash equivalents)

​

$

85,395

​

$

—

​

$

—

​

$

85,395

​

Certificates of deposit

​

​

739

​

​

—

​

​

—

​

​

739

​

Total assets

​

$

86,134

​

$

—

​

$

—

​

$

86,134

​