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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Shares Available for Grant      
Beginning number of shares, available for grant (shares)   3,556,507  
Granted (shares)   (18,370)  
Canceled (shares) 508,847 812  
Ending number of shares, available for grant (shares)   3,436,451 3,556,507
Shares Subject to Options Outstanding      
Beginning number of shares, outstanding (shares)   7,588,405  
Granted (shares)   18,370  
Exercised (shares)   (146,318)  
Canceled (shares)   (82,389)  
Ending number of shares, outstanding (shares)   7,378,068 7,588,405
Options vested and exercisable, number of options (shares)   3,361,540  
Weighted-Average Exercise Price      
Beginning balance of options outstanding (in dollars per share)   $ 4.58  
Granted (unaudited) (in dollars per share)   41.25  
Exercised (unaudited) (in dollars per share)   3.49  
Canceled (unaudited) (in dollars per share)   4.77  
Ending balance of options outstanding (in dollars per share)   4.69 $ 4.58
Options vested and exercisable, weighted average exercise price per share (in dollars per share)   $ 3.61  
Weighted-Average Remaining Contractual Life and Aggregate Intrinsic Value      
Options outstanding, Weighted average remaining contractual term (in years)   8 years 14 days 8 years 3 months 6 days
Options outstanding, Aggregate intrinsic value   $ 531,281 $ 250,495
Options vested and exercisable, Weighted average remaining contractual term (in years)   7 years 4 months 17 days  
Options vested and exercisable, Aggregate intrinsic value   $ 245,680  
Restricted Stock Units      
Shares Available for Grant      
Granted (shares)   (120,835)  
Canceled (shares)   18,337