Common Stock and Stockholders' Equity (Tables)

9 Months Ended

Oct. 31, 2017

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, 2017 (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, 2017		13,016,402		$	5.60		7.92	$	265,542
Option grants		443,182		$	24.35
Options exercised		(2,734,127	)	$	3.70
Options forfeited		(691,959	)	$	6.68
Balance at October 31, 2017		10,033,498		$	6.88		7.44	$	279,670
Exercisable at October 31, 2017		5,839,757		$	4.80		6.81	$	174,902

Summary of Activity Related to RSUs

The following table summarizes the activity related to the Company’s RSUs:

	Number of RSUs Outstanding			Weighted-Average Grant Date Fair Value
Awarded and unvested at January 31, 2017		77,883		$	18.38
Awards granted		2,187,046		$	26.21
Awards vested		(171,734	)	$	23.29
Awards forfeited		(130,180	)	$	22.03
Awarded and unvested at October 31, 2017		1,963,015		$	26.43

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,
	2017		2016		2017		2016
Cost of revenue:
Subscription services	$	585	$	150	$	1,469	$	415
Professional services and other		685		155		1,965		399
Research and development		1,999		357		4,798		982
Sales and marketing		2,212		937		6,152		1,848
General and administrative		2,386		785		6,399		2,005
Total	$	7,867	$	2,384	$	20,783	$	5,649

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, 2017 and 2016 were estimated using the following assumptions:

	Three Months Ended		Nine Months Ended
	October 31,		October 31,
	2017	2016	2017	2016
Employee Stock Options:
Expected term (in years)	6	6	6	6
Volatility	46%	48%	46%	48%
Risk-free interest rate	1.88%	1.27% - 1.33%	1.88% - 2.20%	1.27% - 1.55%
Dividend yield	-	-	-	-
Employee Stock Purchase Plan:
Expected term (in years)	0.5 - 2.0	0.4 - 1.9	0.5 - 2.0	0.4 - 1.9
Volatility	37.30% - 40.88%	48%	37.30% - 42.61%	48%
Risk-free interest rate	1.17% - 1.39%	0.48% - 0.81%	0.89% - 1.39%	0.48% - 0.81%
Dividend yield	-	-	-	-
Market Based Award
Expected term (in years)	-	10	-	10
Volatility	-	48%	-	48%
Risk-free interest rate	-	1.61%	-	1.61%
Dividend yield	-	-	-	-