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Supplemental balance sheet and cash flow information (available-for-sale debt securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Available-for-sale debt securities [Line Items]    
Cost $ 9,380 $ 14,190
Gross unrealized gains 0 0
Gross unrealized losses (1,312) (1,064)
Fair value 8,068 13,126
Expected maturities of available-for-sale debt securities    
Due in one year or less 3,364  
Due in two to five years 1,670  
Due in six to ten years 3,034  
Fair value 8,068 13,126
Cash and cash equivalents [Member]    
Available-for-sale debt securities [Line Items]    
Cash 42,189 35,435
Cash and cash equivalents [Member] | Money market securities [Member] | Domestic [Member]    
Available-for-sale debt securities [Line Items]    
Cost   5,000
Gross unrealized gains   0
Gross unrealized losses   0
Fair value   5,000
Expected maturities of available-for-sale debt securities    
Fair value   5,000
Funds held for customers [Member]    
Available-for-sale debt securities [Line Items]    
Cash 143,893 294,165
Funds held for customers [Member] | Canadian and provincial government securities [Member]    
Available-for-sale debt securities [Line Items]    
Cost 9,380 [1] 9,190 [2]
Gross unrealized gains 0 [1] 0 [2]
Gross unrealized losses (1,312) [1] (1,064) [2]
Fair value 8,068 [1] 8,126 [2]
Expected maturities of available-for-sale debt securities    
Fair value $ 8,068 [1] $ 8,126 [2]
[1] Funds held for customers, as reported on the consolidated balance sheet as of September 30, 2023, also included cash of $143,893.
[2] Funds held for customers, as reported on the consolidated balance sheet as of December 31, 2022, also included cash of $294,165.