Condensed consolidated balance sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 3,458	$ 1,216
Preferred stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized (in shares)	100,000,000	100,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	900,000,000	900,000,000
Common stock, issued (in shares)	76,951,000	71,051,000
Common stock, outstanding (in shares)	76,951,000	71,051,000