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Fair value (Tables)
9 Months Ended
Sep. 30, 2022
Financial instruments  
Schedule of Fair value hierarchy for assets and liabilities

The following table presents the Company’s fair value hierarchy for assets and liabilities measured at fair value as of September 30, 2022 and December 31, 2021:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

 

September 30, 2022

​

 

Level 1

    

Level 2

    

Level 3

    

Total

Assets:

​

​

​

​

​

​

​

​

​

​

​

​

Recurring

​

​

​

​

​

​

​

​

​

​

​

​

Certificate of deposit

​

$

—

​

$

—

​

$

—

​

$

—

Net asset arising from put/call options

​

​

—

​

​

—

​

​

157,000

​

​

157,000

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

 

December 31, 2021

​

 

Level 1

    

Level 2

    

Level 3

    

Total

Assets:

​

​

  

 

​

  

 

​

  

 

​

  

Recurring

​

​

  

 

​

  

 

​

  

 

​

  

Certificate of deposit

​

$

—

​

$

2,500,000

​

$

—

​

$

2,500,000

Net asset arising from put/call options

​

​

—

​

​

—

​

​

128,000

​

​

128,000

Schedule of Net liability arising from put/call options

The activity for the Level 3 asset for the nine months ended September 30, 2022:

​

​

​

​

​

Net asset arising from put/call options

    

​

​

Balance as of December 31, 2021

​

$

128,000

Unrealized gain

​

 

29,000

Balance as of September 30, 2022

​

$

157,000