Quarterly report pursuant to Section 13 or 15(d)

Accumulated other comprehensive loss (Details)

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Accumulated other comprehensive loss (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated other comprehensive loss                
Balance beginning of period     $ (875,000)       $ (875,000)  
Foreign currency translation adjustments $ 24,359,000     $ 58,011,000     (4,830,000) $ 122,496,000
Foreign currency losses on intercompany loan of a long-term investment nature, net of tax of $0 (21,321,000)     (50,489,000)     4,794,000 (103,404,000)
Unrealized holding gains on available-for-sale debt securities, net of tax of $0 69,000     204,000     926,000 (1,267,000)
Reclassification from accumulated other comprehensive (loss) income of gains on available-for-sale debt securities included in net loss, net of tax of $0 (87,000)           (87,000)  
Balance end of period 102,000           102,000  
Accumulated other comprehensive loss (paranthetical)                
Foreign currency gain on intercompany loan of a long-term investment nature, tax 0 $ 0 0 0 $ 0 $ 0 0 0
Unrealized holding gains on available-for-sale debt securities, tax 0 0 0 0 0 0 0 0
Reclassification from accumulated other comprehensive (loss) income of gains on available-for-sale debt securities included in net loss, tax 0           0  
Accumulated foreign currency translation adjustments                
Accumulated other comprehensive loss                
Balance beginning of period (3,019,000) (1,327,000) 55,000 785,000 (7,801,000) (10,785,000) 55,000 (10,785,000)
Foreign currency translation adjustments 24,359,000 (12,281,000) (16,908,000) 58,011,000 47,694,000 16,792,000    
Foreign currency losses on intercompany loan of a long-term investment nature, net of tax of $0 (21,321,000) 10,589,000 15,526,000 (50,489,000) (39,108,000) (13,808,000)    
Balance end of period 19,000 (3,019,000) (1,327,000) 8,307,000 785,000 (7,801,000) 19,000 8,307,000
Accumulated unrealized (losses) gains on available-for-sale debt securities                
Accumulated other comprehensive loss                
Balance beginning of period (73,000) (458,000) (930,000) (1,828,000) (1,512,000) (357,000) (930,000) (357,000)
Unrealized holding gains on available-for-sale debt securities, net of tax of $0 69,000 385,000 472,000 204,000 (316,000) (1,155,000)    
Reclassification from accumulated other comprehensive (loss) income of gains on available-for-sale debt securities included in net loss, net of tax of $0 87,000              
Balance end of period 83,000 (73,000) (458,000) (1,624,000) (1,828,000) (1,512,000) 83,000 (1,624,000)
Accumulated other comprehensive (loss) income                
Accumulated other comprehensive loss                
Balance beginning of period (3,092,000) (1,785,000) (875,000) (1,043,000) (9,313,000) (11,142,000) (875,000) (11,142,000)
Foreign currency translation adjustments 24,359,000 (12,281,000) (16,908,000) 58,011,000 47,694,000 16,792,000    
Foreign currency losses on intercompany loan of a long-term investment nature, net of tax of $0 (21,321,000) 10,589,000 15,526,000 (50,489,000) (39,108,000) (13,808,000)    
Unrealized holding gains on available-for-sale debt securities, net of tax of $0 69,000 385,000 472,000 204,000 (316,000) (1,155,000)    
Reclassification from accumulated other comprehensive (loss) income of gains on available-for-sale debt securities included in net loss, net of tax of $0 87,000              
Balance end of period $ 102,000 $ (3,092,000) $ (1,785,000) $ 6,683,000 $ (1,043,000) $ (9,313,000) $ 102,000 $ 6,683,000