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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 4,891 $ 3,654
Preferred stock, par value $ 0.000001 $ 0.000001
Preferred stock, shares authorized 25,000,000 25,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.000001 $ 0.000001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 72,038,000 71,738,000
Common stock, shares outstanding 72,038,000 71,738,000