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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-based Compensation Expense
Stock-based compensation expense was recorded in the following cost and expense categories consistent with the respective employee or service provider’s related cash compensation (in thousands):
Year ended December 31, 
2017 2016 2015 
Cost of revenue 
Subscription and support $738 $493 $363 
Professional services 465 411 349 
Operating expenses 
Research and development 2,224 2,365 1,924 
Sales and marketing 2,983 2,075 1,727 
General and administrative 13,066 8,903 6,637 
Total $19,476 $14,247 $11,000 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of our stock options and ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions:
Year ended December 31, 
2017 2016 2015 
Stock Options 
Expected term (in years) 0.2 - 6.1 6.0 - 6.1 6.1
Risk-free interest rate 1.5% - 2.2% 1.2% - 2.1% 1.4% - 1.9% 
Expected volatility 23.7% - 43.8% 43.0% - 45.3% 42.4% - 47.1% 
ESPP 
Expected term (in years) 0.5— — 
Risk-free interest rate 1.2%  —%  —%  
Expected volatility 28.5%  —%  —%  
Schedule of Share-based Payment Award, ESPP, Valuation Assumptions
The fair value of our stock options and ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions:
Year ended December 31, 
2017 2016 2015 
Stock Options 
Expected term (in years) 0.2 - 6.1 6.0 - 6.1 6.1
Risk-free interest rate 1.5% - 2.2% 1.2% - 2.1% 1.4% - 1.9% 
Expected volatility 23.7% - 43.8% 43.0% - 45.3% 42.4% - 47.1% 
ESPP 
Expected term (in years) 0.5— — 
Risk-free interest rate 1.2%  —%  —%  
Expected volatility 28.5%  —%  —%  
Schedule of Stock-Option Activity
The following table summarizes the option activity under the Plans for the year ended December 31, 2017:
Options Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value 
(in thousands) 
Outstanding at December 31, 2016 7,532,455 $12.22 7.2$19,988 
Granted 2,111,253 16.10 
Forfeited (339,111)14.93 
Exercised (1,158,820)10.77 
Outstanding at December 31, 2017 8,145,777 $13.33 7.0$65,913 
Exercisable at December 31, 2017 4,607,812 $11.49 5.7$45,653 
Schedule of Restricted Stock Awards
The following table summarizes the restricted stock award activity under the Plan for the year ended December 31, 2017:
Number of Shares Weighted-Average Grant Date Fair Value 
Unvested at December 31, 2016 353,335 $13.40 
Granted — — 
Forfeited — — 
Vested (190,003)13.40 
Unvested at December 31, 2017 163,332 $13.40 
Schedule of Restricted Stock Units
The following table summarizes the restricted stock unit activity under the Plan for the year ended December 31, 2017:
Number of Shares Weighted-Average Grant Date Fair Value 
Unvested at December 31, 2016 381,952 $15.11 
Granted 413,792 13.95 
Forfeited — — 
Vested(1)
(221,672)14.48 
Unvested at December 31, 2017 574,072 $14.51