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Stock-Based Compensation - Stock Option Activity (Details) - 2018 Plan - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Number of Options
Number of options, beginning balance (in shares)	9,190,522
Number of options, options granted (in shares)	2,675,672
Number of options, options exercised (in shares)	(105,895)
Number of options, options forfeited (in shares)	(132,910)
Number of options, ending balance (in shares)	11,627,389
Number of options, exercisable (in shares)	6,716,452
Number of options, vested and expected to vest (in shares)	11,627,389
Weighted- Average Exercise Price
Weighted-average exercise price, beginning balance (in dollars per share)	$ 14.51
Weighted-average exercise price, options granted (in dollars per share)	18.38
Weighted-average exercise price, options exercised (in dollars per share)	2.87
Weighted-average exercise price, options forfeited (in dollars per share)	9.58
Weighted-average exercise price, ending balance (in dollars per share)	15.56
Weighted-average exercise price, exercisable (in dollars per share)	13.66
Weighted-average exercise price, vested and expected to vest (in dollars per share)	$ 15.56
Weighted-average remaining contract term, outstanding	8 years 10 months 13 days	8 years 9 months 25 days
Weighted-average remaining contract term, exercisable	8 years 10 months 24 days
Weighted-average remaining contract term, vested and expected to vest	8 years 10 months 13 days
Aggregate intrinsic value, balance	$ 77,096		$ 110,490
Aggregate intrinsic value, exercisable	51,873
Aggregate intrinsic value, vested and expected to vest	$ 77,096

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