Balance Sheet Components - Other Noncurrent Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Balance Sheet Components [Abstract]
Accounts receivable, noncurrent	$ 25,086	$ 9,011
Equity investment	13,538	3,000
Prepaid expenses, noncurrent	10,635	2,945
Indefinite-lived intangible assets	6,544	2,159
Convertible Note	5,092	0
Intangible assets subject to amortization, net	2,980	0
Other	6,593	5,217
Other assets, noncurrent	$ 70,468	$ 22,332