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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 216 $ 479
Class A Common Stock    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 91,312,647 89,728,223
Common stock, shares outstanding 91,312,647 89,728,223
Class B Common Stock    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 20,502,084 20,702,084
Common stock, shares outstanding 20,502,084 20,702,084