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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Consolidated Statements of Operations        
Nonvested stock amortization expenses $ 551 $ 476 $ 1,073 $ 957