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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Allocation of recognized period costs | The following table summarizes the allocation of stock-based compensation in the consolidated statements of operations (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2019 |  | 2018 |  | 2019
Delivery costs | $ | 203 |  |  | $ | 176 |  |  | $ | 471 |  |  | $ | 539 |
Sales and marketing expense | 1,939 |  |  | 1,432 |  |  | 5,550 |  |  | 3,091 |
Research and development expense | 915 |  |  | 638 |  |  | 3,141 |  |  | 1,204 |
General and administration expense | 2,666 |  |  | 5,240 |  |  | 7,806 |  |  | 7,432 |
Total stock-based compensation expense | $ | 5,723 |  |  | $ | 7,486 |  |  | $ | 16,968 |  |  | $ | 12,266 |
Summary of common stock option activity | Options to purchase shares of common stock generally vest over four years and expire 10 years following the date of grant. A summary of common stock option activity is as follows:
| Shares (in thousands) |  | Weighted-Average Exercise Price |  | Weighted Average Remaining Vesting Period (in years) |  | Aggregate Intrinsic Value(1) (in thousands)
Options outstanding — December 31, 2018 | 1,774 |  |  | $ | 20.55 |  |  | 2.01 |  | $ | 1,214 |
Granted | 39 |  |  | 20.64 |  |  |  |  |
Exercised | (215 | ) |  | 13.25 |  |  |  |  |
Forfeited | (28 | ) |  | 23.82 |  |  |  |  |
Canceled | (65 | ) |  | 22.36 |  |  |  |  |
Options outstanding — September 30, 2019 | 1,505 |  |  | 21.46 |  |  | 1.33 |  | $ | 18,871 |
Exercisable — September 30, 2019 | 1,195 |  |  | $ | 20.70 |  |  |  |  |
Summary of RSU activity | We grant restricted stock units ("RSUs") to employees and our non-employee directors. A summary of RSU activity, inclusive of performance-based RSUs, is as follows:
| Shares (in thousands) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Vesting Period (in years) |  | Unamortized Compensation Costs (in thousands)
Unvested — December 31, 2018 | 381 |  |  | $ | 18.11 |  |  | 2.42 |  | $ | 4,536 |
Granted | 1,792 |  |  | 15.86 |  |  |  |  |
Vested(1) | (324 | ) |  | 14.65 |  |  |  |  |
Forfeited | (112 | ) |  | 19.02 |  |  |  |  |
Unvested — September 30, 2019 | 1,737 |  |  | $ | 16.38 |  |  | 3.06 |  | $ | 21,519 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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