Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Accounts receivable, allowance	$ 614	$ 660
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Shares authorized (in shares)	20,000,000	20,000,000
Shares issued (in shares)	0	0
Shares outstanding (in shares)	0	0
Par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Shares authorized (in shares)	2,250,000,000	2,250,000,000
Shares issued (in shares)	241,359,000	220,979,000
Shares outstanding (in shares)	241,359,000	220,979,000
Class A
Par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Shares authorized (in shares)	2,000,000,000	2,000,000,000
Shares issued (in shares)	255,751,711	243,524,000
Shares outstanding (in shares)	255,752,000	243,524,000
Class B
Par value per share (in dollars per share)	$ 0.0001	$ 0.0001
Shares authorized (in shares)	250,000,000	250,000,000
Shares issued (in shares)	0	0
Shares outstanding (in shares)	0	0