Joint Venture and Spin-off - Schedule of Inter-Company Eliminations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Noncontrolling Interest [Line Items]
Revenue	$ 66,800	$ 42,152	$ 174,857	$ 106,029
Cost of revenue	7,195	4,637	20,812	12,238
Gross profit	59,605	37,515	154,045	93,791
Sales and marketing	50,543	34,837	133,562	99,164
Research and development	24,664	19,042	68,607	57,942
General and administrative	16,939	8,090	40,276	22,113
Total operating expenses	92,146	61,969	242,445	179,219
Loss from operations	(32,541)	(24,454)	(88,400)	(85,428)
Other income, net	(10,209)	(4,005)	(21,252)	13,447
Net loss	(41,748)	(28,608)	(110,796)	(72,156)
Net loss attributable to noncontrolling interest	(521)	$ 0	(1,443)	$ 0
Cash and cash equivalents	824,714		824,714		$ 282,850
Total assets	1,028,808		1,028,808		362,566
Total liabilities	219,401		219,401		$ 168,884
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Revenue	265		297
Cost of revenue	243		604
Gross profit	22		(307)
Sales and marketing	780		1,630
Research and development	499		1,376
General and administrative	621		1,984
Total operating expenses	1,900		4,990
Loss from operations	(1,878)		(5,297)
Other income, net	7		8
Net loss before income taxes	(1,871)		(5,289)
Net loss	(1,871)		(5,289)
Cash and cash equivalents	17,750		17,750
Other assets	2,742		2,742
Total assets	20,492		20,492
Total liabilities	$ 3,009		$ 3,009