Fair Value Measurement (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Accounts Receivable | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Realized/unrealized derivative (loss) gain, net | $ 0 | $ 200 |
| Fair Value Inputs Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Cash and cash equivalents | 33,712 | 25,405 |
| Gold and silver rounds/bullion | 589 | 671 |
| Fair Value Inputs Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Accounts receivable, net | 8,672 | $ 4,226 |
| Derivative liability - zinc zero cost collar | $ (1,844) | |