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Consolidated Statements of Operations (Parenthetical) (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation included in selling, general and administrative expenses | $ 401 | $ 323 | $ 884 | $ 772

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