Overview and Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Sep. 19, 2019	Jun. 14, 2019	May 01, 2018	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Class of Stock [Line Items]
Proceeds from initial public offering of common stock, net of underwriters' discounts and commissions				$ 0	$ 0	$ 163,844
Preferred stock authorized (in shares)			10,000,000	10,000,000	10,000,000
Accumulated deficit				$ (371,437)	$ (256,458)
Common Class A
Class of Stock [Line Items]
Shares issued per common share converted (in shares)	1
Threshold percentage of outstanding stock	15.00%
Common stock authorized (in shares)			500,000,000	500,000,000	500,000,000
Common Class B
Class of Stock [Line Items]
Number of shares issued in conversion (in shares)			68,500,000
Common stock authorized (in shares)			500,000,000	500,000,000	500,000,000
Public equity offering
Class of Stock [Line Items]
Consideration received on transaction		$ 379,000
Underwriting discounts and commissions		12,800
Payment of stock issuance costs, other		$ 900
Public equity offering | Common Class A
Class of Stock [Line Items]
Shares issued and sold (in shares)		9,025,000
Offering price (in dollars per share)		$ 43.50
Public equity offering - selling shareholders | Common Class A
Class of Stock [Line Items]
Shares issued and sold (in shares)		5,810,000
IPO | Common Class A
Class of Stock [Line Items]
Shares issued and sold (in shares)			11,745,088
Offering price (in dollars per share)			$ 15.00
Proceeds from initial public offering of common stock, net of underwriters' discounts and commissions			$ 160,400
Underwriting discounts and commissions			12,300
Other issuance costs			$ 3,400