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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Consolidated Statements of Operations        
Nonvested stock amortization expenses $ 597 $ 534 $ 1,670 $ 1,491