Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended
	Dec. 31, 2019	Jul. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Class of Stock [Line Items]
Stock converted		$ 237,000
Accretion to redemption price of redeemable convertible preferred stock (less than for the three months ended June 30, 2019 and 2018)			$ 0	$ 41
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000	100,000,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	900,000,000	900,000,000	900,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
IPO
Class of Stock [Line Items]
Sale of stock (in shares)		14,590,050
Offering price (in dollars per share)		$ 28.00
Net proceeds from sale of stock		$ 377,500
Underwriting discounts and commissions		28,600
Offering expenses		$ 2,400
Underwriters' Option
Class of Stock [Line Items]
Sale of stock (in shares)		1,903,050
Common Stock
Class of Stock [Line Items]
Stock converted (in shares)		58,615,488
Common Stock | Secondary Offering - Shares From Existing Shareholders [Member]
Class of Stock [Line Items]
Sale of stock (in shares)	2,777,327
Offering price (in dollars per share)	$ 27.00
Maximum
Class of Stock [Line Items]
Accretion to redemption price of redeemable convertible preferred stock (less than for the three months ended June 30, 2019 and 2018)				$ 100