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Fair value of financial instruments (Tables)
9 Months Ended
Sep. 30, 2025
Fair value of financial instruments  
Schedule of financial assets and liabilities accounted for at fair value by fair value hierarchy

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​

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Balance at

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Fair Value Measurements at

​

​

September 30, 

​

Report Date Using

​

    

2025

    

(Level 1)

    

(Level 2)

    

(Level 3)

Deferred compensation liability

​

$

6,069

​

$

6,069

​

$

—

​

$

—

Total

​

$

6,069

​

$

6,069

​

$

—

​

$

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Balance at

​

Fair Value Measurements at

​

​

December 31, 

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Report Date Using

​

    

2024

    

(Level 1)

    

(Level 2)

    

(Level 3)

Deferred compensation liability

​

$

4,969

​

$

4,969

​

$

—

​

$

—

Total

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$

4,969

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$

4,969

​

$

—

​

$

—