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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Accounts receivable |  |
Trade accounts receivable | $ 10,498,000 | $ 8,140,000
Unbilled accounts receivable | 551,000 | 450,000
Allowance for product returns and price adjustments | (384,000) | (397,000)
Accounts receivable, net | $ 10,665,000 | $ 8,193,000

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