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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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