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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 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):
 
 Three months ended September 30,  Nine months ended September 30, 
 2017  2016  2017  2016 
Cost of revenue        
Subscription and support $204  $122  $522  $365 
Professional services 129  100  329  315 
Operating expenses        
Research and development 601  594  1,566  1,787 
Sales and marketing 788  567  2,141  1,471 
General and administrative 2,942  2,287  8,642  6,624 
Total $4,664  $3,670  $13,200  $10,562 
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:

 Three months ended September 30, Nine months ended September 30, 
 2017 2016 2017 2016 
Stock Options 
Expected term (in years) 6.1 6.1 6.0 - 6.1 6.0 - 6.1 
Risk-free interest rate 1.9% - 2.1% 1.2% - 1.3% 1.9% - 2.1% 1.2% - 1.9% 
Expected volatility 38.9% - 39.1% 44.4% - 44.6% 38.9% - 43.8% 44.4% - 45.3% 
 
ESPP 
Expected term (in years) 0.5— 0.5— 
Risk-free interest rate 1.2%  —%  1.2%  — %
Expected volatility 28.5%  —%  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:

 Three months ended September 30, Nine months ended September 30, 
 2017 2016 2017 2016 
Stock Options 
Expected term (in years) 6.1 6.1 6.0 - 6.1 6.0 - 6.1 
Risk-free interest rate 1.9% - 2.1% 1.2% - 1.3% 1.9% - 2.1% 1.2% - 1.9% 
Expected volatility 38.9% - 39.1% 44.4% - 44.6% 38.9% - 43.8% 44.4% - 45.3% 
 
ESPP 
Expected term (in years) 0.5— 0.5— 
Risk-free interest rate 1.2%  —%  1.2%  — %
Expected volatility 28.5%  —%  28.5%  — %
Schedule of Stock-Option Activity
The following table summarizes the option activity under the Plans for the nine months ended September 30, 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 1,772,353 14.99 
Forfeited (279,651)14.55 
Exercised (688,661)9.68 
Outstanding at September 30, 2017 8,336,496 $12.95 7.1$65,845 
 
Exercisable at September 30, 2017 4,727,976 $11.31 5.9$45,104 
Schedule of Restricted Stock Awards
The following table summarizes the restricted stock award activity under the Plan for the nine months ended September 30, 2017:

 Number of Shares  Weighted-Average Grant Date Fair Value 
    
Unvested at December 31, 2016 353,335  $13.40 
Granted —  — 
Forfeited —  — 
Vested (176,670) 13.40 
Unvested at September 30, 2017 176,665  $13.40 
Schedule of Restricted Stock Units
The following table summarizes the restricted stock unit activity under the Plan for the nine months ended September 30, 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) 
(174,211) 14.58 
Unvested at September 30, 2017 621,533  $14.48 
(1) As of September 30, 2017, recipients of 146,075 shares had elected to defer settlement of the vested restricted stock units in accordance with our Nonqualified Deferred Compensation Plan.