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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts $ 451 $ 388
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 32,513,884 32,165,407
Common stock, shares outstanding 32,513,884 32,165,407
Class B Common Stock    
Common stock, par value (in dollars per share) $ 0.0010 $ 0.0010
Common stock, share authorized 500,000,000 500,000,000
Common stock, shares issued 10,179,371 10,203,371
Common stock, shares outstanding 10,179,371 10,203,371