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Stockholders' Equity and Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders Equity And Stock Based Compensation [Abstract]

Summary of Number of Shares of Common Stock Reserved

The number of shares of common stock reserved for the vesting of RSUs and exercise of common stock options are as follows (in thousands):

		December 31, 2018				December 31, 2017
RSUs			1,983				2,085
Common stock options			1,840				2,315
			3,823				4,400

Schedule of Stock Compensation Expense by Award Type

The following two tables show stock compensation expense by award type and where the stock compensation expense is recorded in the Company’s consolidated statements of operations:

		Year Ended December 31,
		2018				2017				2016
		( in thousands)
Options		$	5,108			$	4,948			$	5,202
ESPP			2,833				1,233				1,093
RSUs			68,320				41,136				26,380
Total stock-based compensation		$	76,261			$	47,317			$	32,675

Effect of Stock-Based Compensation on Income by Line Item

The following two tables show stock compensation expense by award type and where the stock compensation expense is recorded in the Company’s consolidated statements of operations:

		2018				2017				2016
		(in thousands)
Cost of revenue, subscription		$	1,476			$	658			$	512
Cost of revenue, service			2,924				2,327				1,640
Research and development			23,328				12,816				8,828
Sales and marketing			31,099				19,016				13,352
General and administrative			17,434				12,500				8,343
Total stock-based compensation		$	76,261			$	47,317			$	32,675

Schedule of Assumptions Used for Estimation of Fair Value of Options Granted to Employees

Stock Options —The fair value of employee options is estimated on the date of each grant using the Black-Scholes option-pricing model with the following assumptions:

		Year Ended December 31,
		2018				2017				2016
Risk-free interest rate (%)		2.62-2.85				1.74-2.09				1.38 - 1.41
Expected term (years)		5.06-6.42				5.18-6.21				5.08 - 6.21
Volatility (%)		41.34-43.55				39.4-43.7				38.0 - 41.0
Expected dividends			—				—				—

Summary of Stock Option Activity

The stock option activity for the year ended December 31, 2018 is as follows:

		Options (in thousands)				Weighted- Average Exercise Price				Weighted- Average Remaining Life (in years)				Aggregate Intrinsic Value (in thousands)
Outstanding—January 1, 2018			2,315			$	16.69				5.3			$	165,974
Granted		146					113.95
Exercised			(608	)		17.87
Forfeited/expired			(13	)		32.01
Outstanding—December 31, 2018			1,840				23.89				4.6			$	187,342
Options vested or expected to vest—December 31, 2018			1,840			$	23.89				4.6			$	187,342
Options exercisable—December 31, 2018			1,576			$	14.38			3.9				$	175,466

Summary of Activity Related to RSUs

The following table summarizes the activity related to RSUs for the year ended December 31, 2018:

		RSUs Outstanding
		Shares (in thousands)				Weighted- Average Grant Date Fair Value Per Share
Unvested and outstanding at January 1, 2018			2,085			$	54.12
Granted			1,162				110.43
Vested			(1,110	)			58.60
Canceled			(154	)			66.00
Unvested and outstanding at December 31, 2018			1,983			$	83.67

Summary of Activity Related to Employee Stock Purchase Plan

The following table summarizes the activity related to ESPP (in thousands, except the weighted average purchase price):

		Shares Issued (in thousands)				Weighted- Average Purchase Price			Total Cash Proceeds (in thousands)
2018			148				80.21			11,863
2017			94				38.83			3,635
2016			70				38.98			2,721

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