STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2023

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 June 30,				Six Months Ended June 30,
	2022		2023		2022		2023
Delivery costs	$	914	$	565	$	1,496	$	1,133
Sales and marketing expense	3,633		3,751		7,337		6,804
Research and development expense	4,247		4,502		7,451		8,587
General and administration expense	4,048		2,921		10,143		3,183
Total stock-based compensation expense	$	12,842	$	11,739	$	26,427	$	19,707

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, 2022	5,956	$	25.43
Granted	2,728	5.16
Vested	(578)	47.22
Forfeited	(633)	33.92
Unvested — June 30, 2023	7,473	$	15.74	2.38	$	89,232
Shares expected to vest - June 30, 2023	7,380