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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowances for doubtful accounts $ 300 $ 273
Provision for obsolescence $ 388 $ 392
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 75,000,000 75,000,000
Common stock, shares outstanding (in shares) 34,289,222 34,169,952
Common stock, shares issued (in shares) 34,289,222 34,312,527