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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Allowance for doubtful accounts $ 646 $ 900
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Class A Common Stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, share authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 31,358,479 30,369,199
Common stock, shares outstanding 31,358,479 30,369,199
Class B Common Stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, share authorized 500,000,000 500,000,000
Common stock, shares issued 10,546,534 10,891,888
Common stock, shares outstanding 10,546,534 10,891,888