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Fair value measurements (Tables)
6 Months Ended
Jun. 30, 2022
Fair value measurements  
Assets and liabilities measured at fair value on a recurring basis

Assets and liabilities measured at fair value on a recurring basis as of June 30, 2022 and December 31, 2021 are as follows:

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Quoted Prices

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Significant

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in Active

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Other

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Significant

 

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Markets for

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Observable

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Unobservable

 

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Identical Assets

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Inputs

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Inputs

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Assets

    

Total

    

(Level 1)

    

(Level 2)

    

(Level 3)

 

June 30, 2022

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(in thousands)

 

Money market funds included in cash and cash equivalents

    

$

75,562

    

$

75,562

    

$

—

    

$

—

​

Marketable securities - U.S. Treasury notes

​

 

69,727

​

 

69,727

​

 

—

​

 

—

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Total

​

$

145,288

​

$

145,288

​

$

—

​

$

—

​

December 31, 2021

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​

​

​

​

​

​

​

​

​

​

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Money market funds included in cash and cash equivalents

    

$

100,305

    

$

100,305

    

$

—

    

$

—

​

Marketable securities - U.S. Treasury notes

​

​

15,106

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15,106

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​

​

​

​

​

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Total

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$

115,411

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$

115,411

​

$

—

​

$

—

​