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Fair value measurement (Tables)
12 Months Ended
Dec. 31, 2020
Fair value measurement  
Schedule of financial assets and liabilities that are measured at fair value on a recurring basis

At December 31, 2020

    

Level 1

    

Level 2

    

Level 3

    

Total

Assets:

Money market funds

$

20,825

$

$

$

20,825

Marketable securities

 

4,565

 

 

4,565

Total assets

$

20,825

$

4,565

$

$

25,390

At December 31, 2019

    

 

Level 1

    

 

Level 2

    

 

Level 3

    

 

Total

Assets:

Money market funds

$

32,843

$

1,497

$

$

34,340

Marketable securities

6,262

33,952

40,214

Total assets

$

39,105

$

35,449

$

$

74,554

Schedule of reconciliation of the beginning and ending amounts related to the fair value of contingent consideration categorized as Level 3

Beginning balance, January 1, 2019

$

961

Change in fair value

(961)

Balance, December 31, 2019

    

$