Balance sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,353	$ 943
Accumulated depreciation and amortization, property and equipment	37,813	35,551
Accumulated amortization, capitalized internal-use software	20,847	19,554
Accumulated amortization, intangible assets	$ 331	$ 271
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	37,599,441	36,610,763
Common stock, shares outstanding (in shares)	37,599,441	36,610,763