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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
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 June 30,Six months ended June 30,
2018201720182017
Cost of revenue
Subscription and support$228 $178 $399 $318 
Professional services146 100 296 200 
Operating expenses
Research and development1,495 472 2,516 965 
Sales and marketing1,440 694 2,553 1,353 
General and administrative7,156 2,953 10,606 5,700 
Total$10,465 $4,397 $16,370 $8,536 
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 June 30,Six months ended June 30,
2018201720182017
Stock Options
Expected term (in years)— 6.1— 6.0 - 6.1
Risk-free interest rate —%  1.9% - 2.0% —%  1.9% - 2.1%
Expected volatility —%  39.3% - 39.6% —%  39.3% - 43.8%
ESPP
Expected term (in years)— — 0.5— 
Risk-free interest rate—%  —%  1.8%  —%  
Expected volatility—%  —%  22.2%  —%  
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 June 30,Six months ended June 30,
2018201720182017
Stock Options
Expected term (in years)— 6.1— 6.0 - 6.1
Risk-free interest rate —%  1.9% - 2.0% —%  1.9% - 2.1%
Expected volatility —%  39.3% - 39.6% —%  39.3% - 43.8%
ESPP
Expected term (in years)— — 0.5— 
Risk-free interest rate—%  —%  1.8%  —%  
Expected volatility—%  —%  22.2%  —%  
Schedule of Stock-Option Activity
The following table summarizes the option activity under the Plans for the six months ended June 30, 2018:




Options 

Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term (Years)
Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 20178,145,777 $13.33 7.0$65,913 
Granted— — 
Forfeited(105,977)16.95 
Exercised(624,388)10.24 
Outstanding at June 30, 20187,415,412 $13.54 6.6$80,539 
Exercisable at June 30, 20185,237,069 $12.36 5.8$63,072 
Summary of Restricted Stock Awards
The following table summarizes the restricted stock award activity under the Plan for the six months ended June 30, 2018:




Number of Shares
Weighted-
Average Grant Date Fair Value
Unvested at December 31, 2017163,332 $13.40 
Granted— — 
Forfeited— — 
Vested(163,332)13.40 
Unvested at June 30, 2018— $— 
Summary of Restricted Stock Units
The following table summarizes the restricted stock unit activity under the Plan for the six months ended June 30, 2018:




Number of Shares
Weighted-
Average Grant Date Fair Value
Unvested at December 31, 2017574,072 $14.51 
Granted1,933,643 22.96 
Forfeited(22,004)22.23 
Vested(1)
(439,436)16.46 
Unvested at June 30, 20182,046,275 $22.00 
(1) As of June 30, 2018, recipients of 554,621 shares had elected to defer settlement of the vested restricted stock units in accordance with our Nonqualified Deferred Compensation Plan.