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Net Loss Per Share - Earnings Per Share Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator        
Net loss $ (14,073) $ (12,891) $ (30,105) $ (36,461)
Denominator        
Weighted-average common shares outstanding - basic and diluted (in shares) 41,815,139 40,762,960 41,453,736 40,603,430
Basic and diluted net loss per share (in dollars per share) $ (0.34) $ (0.32) $ (0.73) $ (0.90)
Class A Common Stock        
Numerator        
Net loss $ (10,467) $ (9,369) $ (22,255) $ (26,076)
Denominator        
Weighted-average common shares outstanding - basic and diluted (in shares) 31,100,994 29,624,794 30,644,955 29,038,566
Basic and diluted net loss per share (in dollars per share) $ (0.34) $ (0.32) $ (0.73) $ (0.90)
Class B Common Stock        
Numerator        
Net loss $ (3,606) $ (3,522) $ (7,850) $ (10,385)
Denominator        
Weighted-average common shares outstanding - basic and diluted (in shares) 10,714,145 11,138,166 10,808,781 11,564,864
Basic and diluted net loss per share (in dollars per share) $ (0.34) $ (0.32) $ (0.73) $ (0.90)