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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Payment Arrangement [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 June 30, |  | Six Months Ended June 30,
| 2019 |  | 2020 |  | 2019 |  | 2020
Delivery costs | $ | 199 |  |  | $ | 357 |  |  | $ | 363 |  |  | $ | 532 |
Sales and marketing expense | 952 |  |  | 2,567 |  |  | 1,659 |  |  | 3,836 |
Research and development expense | 363 |  |  | 1,401 |  |  | 566 |  |  | 2,004 |
General and administration expense | 1,558 |  |  | 4,783 |  |  | 2,192 |  |  | 6,861 |
Total stock-based compensation expense | $ | 3,072 |  |  | $ | 9,108 |  |  | $ | 4,780 |  |  | $ | 13,233 |
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. The following table summarizes changes in common stock options:
| Shares (in thousands) |  | Weighted-Average Exercise Price |  | Weighted Average Contractual Life (in years) |  | Aggregate Intrinsic Value(1) (in thousands)
Options outstanding — December 31, 2019 | 1,000 |  |  | $ | 22.99 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (275 | ) |  | 19.71 |  |  |  |  | $ | 14,956 |
Forfeited | (9 | ) |  | 28.71 |  |  |  |  |
Canceled | (1 | ) |  | 28.96 |  |  |  |  |
Options outstanding — June 30, 2020 | 715 |  |  | 24.17 |  |  | 6.12 |  | $ | 32,752 |
Exercisable — June 30, 2020 | 607 |  |  | $ | 23.87 |  |  | 5.99 |  | $ | 27,983 |
Summary of RSU activity | We grant restricted stock units ("RSUs") to employees and our non-employee directors. The following table summarizes changes in RSUs, inclusive of performance-based RSUs:
| Shares (in thousands) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Contractual Term (in years) |  | Unamortized Compensation Costs (in thousands)
Unvested — December 31, 2019 | 1,741 |  |  | $ | 18.55 |  |  |  |  |
Granted | 1,544 |  |  | 38.29 |  |  |  |  |
Vested | (416 | ) |  | 18.88 |  |  |  |  |
Forfeited | (242 | ) |  | 22.16 |  |  |  |  |
Unvested — June 30, 2020 | 2,627 |  |  | $ | 29.76 |  |  | 3.42 |  | $ | 64,036 |

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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=116856206&loc=d3e5070-113901 + Details
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