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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 1,715 $ 2,215
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 750,000,000 750,000,000
Common stock, shares issued (in shares) 85,590,417 85,041,581
Common stock, shares outstanding (in shares) 80,007,149 79,929,335
Treasury stock, at cost (in shares) 5,583,268 5,112,246