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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