Common Stock and Stockholders' Equity (Tables)

9 Months Ended

Oct. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following table summarizes stock option activity under the Company’s 2006 Stock Plan and the 2016 Plan during the nine months ended October 31, 2019 (aggregate intrinsic value in thousands):

	Options Outstanding
	Outstanding Stock Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in Years)		Aggregate Intrinsic Value
Balance at January 31, 2019		6,850,928			11.44		6.84	$	517,353
Option grants		132,383			94.47		—		—
Options exercised		(2,164,147	)		6.34		—		—
Options forfeited		(36,706	)		8.83		—		—
Balance at October 31, 2019		4,782,458			16.07		6.51	$	580,685
Exercisable at October 31, 2019		3,605,761			9.57		6.12	$	461,235

Summary of Activity Related to RSUs

The following table summarizes the activity related to the Company’s RSUs during the nine months ended October 31, 2019:

	Number of RSUs Outstanding			Weighted- Average Grant Date Fair Value
Awarded and unvested at January 31, 2019		2,792,117		$	42.62
Awards granted		1,361,518		$	100.81
Awards vested		(840,059	)	$	46.93
Awards forfeited		(216,232	)	$	60.75
Awarded and unvested at October 31, 2019		3,097,344		$	65.77

Total Stock-Based Compensation Expense

The Company’s total stock-based compensation expense as of the dates indicated was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	October 31,				October 31,
	2019		2018		2019		2018
Cost of revenue:
Subscription	$	1,886	$	1,152	$	5,045	$	3,076
Professional services and other		2,113		1,071		5,581		3,086
Research and development		5,517		3,046		14,640		8,551
Sales and marketing		6,135		3,899		17,034		10,732
General and administrative		6,304		4,652		17,768		13,245
Total	$	21,955	$	13,820	$	60,068	$	38,690

Assumptions used to Estimate Fair Values of Stock Options Granted

The fair values of the Company’s stock options granted during the three and nine months ended October 31, 2019 and 2018 were estimated using the following assumptions:

	Three Months Ended		Nine Months Ended
	October 31,		October 31,
	2019	2018	2019	2018
Employee Stock Options:
Expected term (in years)	—	—	6.0	6.0
Volatility	—	—	42.7%	42.2%
Risk-free interest rate	—	—	2.4%	2.8%
Dividend yield	—	—	—	—
Employee Stock Purchase Plan:
Expected term (in years)	0.5 - 2.0	0.5 - 2.0	0.5 - 2.0	0.5 - 2.0
Volatility	44.4% - 55.9%	31.1% - 34.1%	44.4% - 65.9%	31.1% - 34.1%
Risk-free interest rate	1.7% - 1.9%	2.4% - 2.8%	1.7% - 2.5%	2.0% - 2.8%
Dividend yield	—	—	—	—
Market-based Award
Expected term (in years)	—	—	—	7.1
Volatility	—	—	—	43.7%
Risk-free interest rate	—	—	—	2.8%
Dividend yield	—	—	—	—