Goodwill and Acquired Intangible Assets, Net - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Goodwill [Roll Forward]
Balance, beginning of the year	$ 41,878	$ 1,700
Increase in goodwill related to business combinations	13,952	40,178
Balance, end of the year	$ 55,830	$ 41,878