Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

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

Schedule of Stock-based Compensation Expense

Stock-based compensation expense associated with stock options and restricted stock was recorded in the following cost and expense categories consistent with the respective employee or service provider’s related cash compensation (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2016		2015		2016		2015
Cost of revenue
Subscription and support	$	122	$	92	$	365	$	275
Professional services	100		90		315		251
Operating expenses
Research and development	594		586		1,787		1,289
Sales and marketing	567		461		1,471		1,243
General and administrative	2,287		1,853		6,624		4,818
Total	$	3,670	$	3,082	$	10,562	$	7,876

Schedule of Share-based Payment Award, Valuation Assumptions

The fair value of our stock options was estimated assuming no expected dividends and the following weighted-average assumptions:

	Three months ended September 30,		Nine months ended September 30,
	2016	2015	2016	2015
Expected term (in years)	6.1	6.1	6.1	6.1
Risk-free interest rate	1.15% - 1.32%	1.70% - 1.93%	1.15% - 1.90%	1.35% - 1.93%
Expected volatility	44.36% - 44.57%	46.09% - 47.07%	44.36% - 45.29%	42.35% - 47.07%

Schedule of Stock-Option Activity

The following table summarizes the option activity under the Plans for the nine months ended September 30, 2016:

	Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
						(in thousands)
Outstanding at December 31, 2015	6,969,133		$	11.37	7.7	$	43,287
Granted	1,194,119		15.24
Forfeited	(251,073	)	14.58
Exercised	(322,228	)	4.22
Outstanding at September 30, 2016	7,589,951		$	12.18	7.4	$	45,209
Exercisable at September 30, 2016	4,107,422		$	9.69	6.3	$	34,677

Schedule of Restricted Stock Activity

The following table summarizes the restricted stock activity under the Plan for the nine months ended September 30, 2016:

	Number of Shares		Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
					(in thousands)
Outstanding at December 31, 2015	600,025		$	13.38	$	10,542
Granted	381,952		15.11
Forfeited	—		—
Vested	(246,690	)	13.35
Outstanding at September 30, 2016	735,287		$	14.29	$	13,331