Stock-Based Compensation (Tables)

12 Months Ended

Jan. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

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

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

	Fiscal Year Ended January 31,
	2019		2018		2017
Cost of revenue	$	920	$	1,102	$	1,026
Sales and marketing		1,442		1,818		1,438
Research and development		3,762		3,972		3,586
General and administrative		4,246		4,029		3,722
Total stock-based compensation expense	$	10,370	$	10,921	$	9,772

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, as applicable:

	Fiscal Year Ended January 31,
	2019	2018	2017
Stock Options:
Expected volatility	43%	47%	NA
Expected term (in years)	6.1	6.1	NA
Risk-free interest rate	2.7	1.8%-2.1%	NA
Dividend yield	NA	NA	NA
	Fiscal Year Ended January 31,
	2019	2018	2017
ESPP:
Expected volatility	39%-56%	35%-41%	37%-50%
Expected term (in years)	0.5-2.0	0.5-2.0	0.5-2.0
Risk-free interest rate	2.0%-2.8%	0.9%-1.4%	0.5%-1.0%
Dividend yield	NA	NA	NA