Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The Company used the Black-Scholes model to estimate the fair value of 2015 ESPP awards with the following weighted-average assumptions:

	Six Months Ended
	June 30, 2018		June 30, 2017
Expected volatility factor	0.27 - 0.29		0.29
Risk free interest rate	1.12% - 1.63%		0.60	%
Expected dividend yield	0	%	0	%
Expected life (in years)	0.5		0.5

Schedule of Total Stock-based Compensation Recognized by Income Statement Classification

The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands):

	Three Months Ended				Six Months Ended
Income Statement Classifications	June 30, 2018		June 30, 2017		June 30, 2018		June 30, 2017
Cost of subscription, support and services	$	2,241	$	815	$	3,721	$	1,407
Research and development	17,715		11,660		28,508		21,326
Sales, marketing and services	19,618		14,728		33,185		26,325
General and administrative	16,270		13,476		26,153		26,429
Total	$	55,844	$	40,679	$	91,567	$	75,487

Schedule of Assumptions Used to Value Nonvested Share Grants

The grant date fair value of the non-vested performance stock unit awards was determined through the use of a Monte Carlo simulation model, which utilized multiple input variables that determined the probability of satisfying the market condition requirements applicable to each award as follows:

	March 2017 Grant
Expected volatility factor	0.27-0.32
Risk free interest rate	1.48	%
Expected dividend yield	0	%