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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts receivable |  |
Trade accounts receivable | $ 9,240 | $ 7,590
Unbilled accounts receivable | 1,308 | 255
Allowance for product returns and price concessions | (233) | (238)
Accounts receivable, net | $ 10,315 | $ 7,607

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