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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Statement Of Financial Position [Abstract] |  |
Account receivable allowance | $ 344 | $ 429
Shares issued | 37,874,868 | 37,868,046
Shares outstanding | 37,874,868 | 37,868,046

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