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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [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, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Cost of revenue |  |  |  |  |  |  |
Subscription and support | $ | 436 |  |  | $ | 399 |  |  | $ | 867 |  |  | $ | 756 |
Professional services | 365 |  |  | 431 |  |  | 790 |  |  | 840 |
Operating expenses |  |  |  |  |  |  |
Research and development | 2,040 |  |  | 1,851 |  |  | 3,623 |  |  | 3,751 |
Sales and marketing | 2,944 |  |  | 2,032 |  |  | 5,680 |  |  | 3,996 |
General and administrative | 9,109 |  |  | 3,800 |  |  | 13,870 |  |  | 7,363 |
Total | $ | 14,894 |  |  | $ | 8,513 |  |  | $ | 24,830 |  |  | $ | 16,706 |
Schedule of Stock-Option Activity | The following table summarizes the option activity under the Plans for the six months ended June 30, 2020:
| Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
|  |  |  |  |  |  | (in thousands)
Outstanding at December 31, 2019 | 4,353,167 |  |  | $ | 14.32 |  |  | 5.6 |  | $ | 120,714 |
Granted | — |  |  | — |  |  |  |  |
Forfeited | (45,719) |  |  | 21.47 |  |  |  |  |
Exercised | (668,220) |  |  | 14.15 |  |  |  |  |
Outstanding at June 30, 2020 | 3,639,228 |  |  | $ | 14.26 |  |  | 5.1 |  | $ | 142,764 |
Exercisable at June 30, 2020 | 3,376,057 |  |  | $ | 13.97 |  |  | 4.9 |  | $ | 133,426 |
Summary of Restricted Stock Units | The following table summarizes the restricted stock unit activity under the Plan for the six months ended June 30, 2020:
| Number of Shares |  | Weighted- Average Grant Date Fair Value
Unvested at December 31, 2019 | 3,039,020 |  |  | $ | 31.39 |
Granted | 882,672 |  |  | 43.00 |
Forfeited | (243,540) |  |  | 37.02 |
Vested(1) | (671,435) |  |  | 31.90 |
Unvested at June 30, 2020 | 3,006,717 |  |  | $ | 35.09 |
(1) During the six months ended June 30, 2020, in accordance with our Nonqualified Deferred Compensation Plan, recipients of 409,302 shares had elected to defer settlement of the vested restricted stock units and 7,420 shares were released from deferral. This resulted in total deferred units of 939,084 as of June 30, 2020.
Schedule of Valuation Assumptions, Employee Stock Purchase Plans | The fair value of our ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions:
| Six months ended June 30, |  |
| 2020 |  | 2019
Expected term (in years) | 0.5 |  | 0.5
Risk-free interest rate | 1.5% |  | 2.6%
Expected volatility | 40.6% |  | 48.6%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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