Stock-Based Compensation (Tables)

6 Months Ended

Jul. 31, 2019

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of stock option activity

		Weighted-
		Average
	Number of	Exercise Price
	Shares	Per Share
	(in thousands)
Options outstanding at January 31, 2019	26,535	$	3.87
Granted	880	$	14.65
Exercised	(706)	$	2.14
Canceled	(509)	$	7.34
Options outstanding as of April 30, 2019	26,200	$	4.21
Granted	168	$	34.00
Exercised	(4,776)	$	3.62
Canceled	(325)	$	5.06
Options outstanding at July 31, 2019	21,267	$	4.56
Options vested and expected to vest at July 31, 2019	21,267	$	4.56
Options exercisable at July 31, 2019	10,810	$	1.97

Schedule of restricted stock units

		Weighted-
		Average Grant
	Number of	Date Fair Value
	Shares	Per Share
	(in thousands)
RSUs outstanding at January 31, 2019	4,059	$	12.66
Granted	853	$	18.32
Vested	—	$	—
Forfeited	(159)	$	12.62
RSUs outstanding at April 30, 2019	4,753	$	13.33
Granted	1,014	$	41.35
Vested	—	$	—
Forfeited	(38)	$	20.59
RSUs outstanding at July 31, 2019	5,729	$	18.61
RSUs expected to vest at July 31, 2019	5,729	$	18.61

Schedule of stock-based compensation expense

	Three Months Ended July 31,				Six Months Ended July 31,
	2019		2018		2019		2018
	(in thousands)				(in thousands)
Subscription cost of revenue	$	1,233	$	88	$	1,498	$	151
Professional services cost of revenue		644		57		747		103
Sales and marketing		6,638		1,031		8,156		1,804
Research and development		4,976		539		5,657		987
General and administrative		16,368		509		17,553		898
Total stock-based compensation expense	$	29,859	$	2,224	$	33,611	$	3,943

Employee Stock Purchase Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of assumptions used to estimate fair value on date of grant

	Six Months Ended July 31,
	2019
Expected term (in years)	0.5 - 2.0
Risk-free interest rate	1.9 - 2.2	%
Expected stock price volatility	33.0 - 35.7	%
Dividend yield	—	%

Stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of assumptions used to estimate fair value on date of grant

	Six Months Ended July 31,
	2019		2018
Expected term (in years)	6.05		6.05
Risk-free interest rate	2.0	%	2.9	%
Expected stock price volatility	37.7	%	38.1	%
Dividend yield	—	%	—	%