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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 445 $ 454
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares outstanding (in shares) 19,775,000 19,697,000
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 19,775,000 19,697,000