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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net allowance for doubtful accounts $ 100 $ 200
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 29,544 25,405
Gold and silver rounds/bullion 559 671
Derivative liability - zinc zero cost collar (144)  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accounts receivable, net $ 4,947 $ 4,226