Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) |
Sep. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Summary of Significant Accounting Policies | ||
| Customer allowance for prompt payment discounts | $ 100,000 | $ 171,000 |
| X | ||||||||||
- Definition Amount of customer allowances for prompt payment discounts. No definition available.
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| X | ||||||||||
- References No definition available.
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