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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivable, net of allowance for doubtful accounts $ 780 $ 670
Series preferred stock, shares authorized 4,998,000 4,998,000
Series preferred stock, outstanding 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 30,037,000 28,984,000
Common stock, shares outstanding 26,853,000 25,800,000
Treasury stock, shares 3,184,000 3,184,000