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Accounts Receivable - Trade - Schedule of Accounts Receivable - Trade (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Receivables [Abstract] |  |
Accounts receivable - trade | $ 21,769 | $ 4,522
Allowance for doubtful accounts | (473) | (358)
Allowance for sales returns and volume rebates | (426) | (499)
Accounts receivable - trade, net of allowances | $ 20,869 | $ 3,665

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