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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 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 March 31,
| 2018 |  | 2017
Cost of revenue |  |  |
Subscription and support | $ | 171 |  | $ | 140
Professional services | 150 |  | 100
Operating expenses |  |  |
Research and development | 1,021 |  | 493
Sales and marketing | 1,113 |  | 659
General and administrative | 3,450 |  | 2,747
Total | $ | 5,905 |  | $ | 4,139
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 March 31,
| 2018 |  | 2017
Stock Options |  |  |
Expected term (in years) | — |  | 6.0 - 6.1
Risk-free interest rate | —% |  |  | 2.10% |
Expected volatility | —% |  |  | 39.9% - 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 March 31,
| 2018 |  | 2017
Stock Options |  |  |
Expected term (in years) | — |  | 6.0 - 6.1
Risk-free interest rate | —% |  |  | 2.10% |
Expected volatility | —% |  |  | 39.9% - 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 three months ended March 31, 2018:
| Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
|  |  |  |  |  |  | (in thousands)
Outstanding at December 31, 2017 | 8,145,777 |  | $ | 13.33 |  | 7.0 |  | $ | 65,913
Granted | — |  | — |  |  |  |
Forfeited | (42,110) |  | 18.30 |  |  |  |
Exercised | (296,061) |  | 10.39 |  |  |  |
Outstanding at March 31, 2018 | 7,807,606 |  | $ | 13.42 |  | 6.8 |  | $ | 80,299
Exercisable at March 31, 2018 | 5,026,156 |  | $ | 11.95 |  | 5.9 |  | $ | 59,037
Schedule of Restricted Stock Shares | The following table summarizes the restricted stock award activity under the Plan for the three months ended March 31, 2018:
| Number of Shares |  | Weighted-Average Grant Date Fair Value
Unvested at December 31, 2017 | 163,332 |  | $ | 13.40
Granted | — |  | —
Forfeited | — |  | —
Vested | (163,332) |  | 13.40
Unvested at March 31, 2018 | — |  | $ | —
Schedule of Restricted Stock Units | The following table summarizes the restricted stock unit activity under the Plan for the three months ended March 31, 2018:
| Number of Shares |  | Weighted-Average Grant Date Fair Value
Unvested at December 31, 2017 | 574,072 |  | $ | 14.51
Granted | 1,552,187 |  | 22.24
Forfeited | (2,592) |  | 21.25
Vested(1) | (206,619) |  | 14.34
Unvested at March 31, 2018 | 1,917,048 |  | $ | 20.78
(1) As of March 31, 2018, recipients of 388,747 shares had elected to defer settlement of the vested restricted stock units in accordance with our Nonqualified Deferred Compensation Plan.

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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