Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,225	$ 2,100
Common stock, par value
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	24,247,000	24,128,000
Common Stock, shares outstanding	24,247,000	24,128,000