| Description of Business - Additional Information (Details) | 1 Months Ended | 3 Months Ended | |
|---|---|---|---|
| Apr. 30, 2021 | Sep. 30, 2021  reportable_segments  Coin | Mar. 19, 2021 | |
| Description Of Business [Line Items] | |||
| Number of reportable segments | reportable_segments | 3 | ||
| Number of coins and bar products | Coin | 1,000 | ||
| JMB | |||
| Description Of Business [Line Items] | |||
| Business acquisition, percentage of interests acquired | 79.50% | ||
| Precious Metals Purchasing Partners, LLC | |||
| Description Of Business [Line Items] | |||
| Percentage of ownership percentage | 50.00% | ||
| Collectible Card Partners, LLC | |||
| Description Of Business [Line Items] | |||
| Percentage of ownership percentage | 50.00% | 
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- Definition Description of business. No definition available. 
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- Definition Number of coins and bar products. No definition available. 
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership. No definition available. 
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- Details 
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- Details 
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