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Net Income (Loss) Per Share - Reconciliation of Numerator and Denominator in Basic and Diluted Net Income (Loss) Per Common Share Computations (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 income (loss) $ 5,865 $ (2,377) $ 11,995 $ (1,288)
Adjustments to numerator:        
Dividend paid to preferred stockholders       (66,531)
Accretion of convertible preferred stock to maximum redemption value   (371,228)   (436,317)
Net income (loss) attributable to common stockholders $ 5,865 $ (373,605) $ 11,995 $ (504,136)
Denominator:        
Weighted average common shares outstanding - basic 45,813,801 5,109,016 45,132,567 2,151,324
Weighted average common shares outstanding - diluted 49,283,247 5,109,016 49,462,166 2,151,324
Net income (loss) per share:        
Basic $ 0.13 $ (73.13) $ 0.27 $ (234.34)
Diluted $ 0.12 $ (73.13) $ 0.24 $ (234.34)
Anti-dilutive securities excluded from diluted EPS:        
Anti-dilutive securities excluded from diluted EPS, Total 1,348,223 7,679,700 517,204 7,679,700
Stock Options        
Denominator:        
Diluted common equivalents 3,241,620   4,064,723  
Anti-dilutive securities excluded from diluted EPS:        
Anti-dilutive securities excluded from diluted EPS, Total 601,749 7,083,483 503,516 7,083,483
Restricted Stock Units        
Denominator:        
Diluted common equivalents 227,826   256,394  
Anti-dilutive securities excluded from diluted EPS:        
Anti-dilutive securities excluded from diluted EPS, Total 444,274 596,217 13,688 596,217
Restricted Stock Awards        
Denominator:        
Diluted common equivalents     8,482  
Anti-dilutive securities excluded from diluted EPS:        
Anti-dilutive securities excluded from diluted EPS, Total 302,200