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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Allocation of recognized period costs

The following table summarizes the allocation of stock-based compensation in the condensed consolidated statements of operations (in thousands):

			Three Months Ended September 30,												Nine Months Ended September 30,
			2019						2020						2019						2020
Delivery costs			$	176					$	365					$	539					$	897
Sales and marketing expense			1,432						3,791						3,091						7,627
Research and development expense			638						1,510						1,204						3,514
General and administration expense			5,240						5,912						7,432						12,773
Total stock-based compensation expense			$	7,486					$	11,578					$	12,266					$	24,811

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			(324)						19.66												$	17,774
Forfeited			(17)						28.10
Canceled			(1)						20.67
Options outstanding — September 30, 2020			658						24.49						5.88						$	30,321
Exercisable — September 30, 2020			595						$	24.32					5.79						$	27,516

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			1,671						40.86
Vested(1)			(616)						24.41
Forfeited			(251)						22.88
Unvested — September 30, 2020			2,545						$	31.35					3.40						$	63,299

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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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.

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