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Goodwill - Changes in Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Goodwill    
Balance at the beginning of the period $ 59,872 $ 59,839
Translation adjustments 30 33
Bid4Assets acquisition   28,825
Balance at the end of the period 88,727 59,872
CAG    
Goodwill    
Balance at the beginning of the period 21,583 21,550
Translation adjustments 30 33
Bid4Assets acquisition   0
Balance at the end of the period 21,613 21,583
GovDeals    
Goodwill    
Balance at the beginning of the period 23,731 23,731
Translation adjustments 0 0
Bid4Assets acquisition 28,825  
Balance at the end of the period 52,556 23,731
Machinio    
Goodwill    
Balance at the beginning of the period 14,558 14,558
Translation adjustments 0 0
Bid4Assets acquisition   0
Balance at the end of the period $ 14,558 $ 14,558