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Inventories, Net - Schedule of Inventories, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Inventory [Line Items]        
Allowance for inventory obsolescence $ (356) $ (307) $ (279) $ (260)
Total inventories, net 37,256 39,331    
Loose diamonds        
Inventory [Line Items]        
Inventory, gross 8,986 11,894    
Fine jewelry and other        
Inventory [Line Items]        
Inventory, gross $ 28,626 $ 27,744