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Inventories, Net - Schedule of Inventories, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory [Line Items]        
Allowance for inventory obsolescence $ (260) $ (242) $ (169) $ (145)
Total inventories, net 24,743 13,559    
Loose diamonds        
Inventory [Line Items]        
Inventory, gross 9,013 4,938    
Fine jewelry and other        
Inventory [Line Items]        
Inventory, gross $ 15,990 $ 8,863