Stock-Based Compensation (Tables)

3 Months Ended

Apr. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Total Stock-Based Compensation Recognized for Stock-Based Awards in Condensed Consolidated Statements of Operations

Total stock-based compensation recognized for stock-based awards in the condensed consolidated statements of operations was as follows (in thousands):

	Three Months Ended
	April 30, 2018		April 30, 2017
Cost of revenue	$	192	$	315
Sales and marketing		326		520
Research and development		863		1,068
General and administrative		933		1,068
Total stock-based compensation expense	$	2,314	$	2,971

Summary of Assumptions Used to Estimate Fair Value of Employee Stock Options Grants and Employee Stock Purchase Plan Using Black-Scholes Option Pricing Model

The fair value of employee stock options and ESPP was estimated using the Black–Scholes model with the following assumptions:

	Three Months Ended
	April 30, 2018	April 30, 2017
Stock Options:
Expected volatility	43%	47%
Expected term (in years)	6.1	6.1
Risk-free interest rate	2.7%	2.1%
Dividend yield	—%	—%
ESPP:
Expected volatility	47%-56%	35%-41%
Expected term (in years)	0.5-2.0	0.5-2.0
Risk-free interest rate	2.0%-2.3%	0.9%-1.3%
Dividend yield	—%	—%