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STOCK-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 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
September 30,
Nine Months Ended
September 30,
 2022202320222023
Delivery costs$920 $667 $2,416 $1,800 
Sales and marketing expense1,428 2,683 8,765 9,487 
Research and development expense1,968 3,661 9,419 12,248 
General and administration expense1,451 3,238 11,594 6,421 
Total stock-based compensation expense$5,767 $10,249 $32,194 $29,956 
Summary of RSU activity
We grant restricted stock units ("RSUs") to certain 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 ValueWeighted-Average Remaining Contractual Term (in years)Unamortized Compensation Costs
(in thousands)
Unvested — December 31, 2022
5,956 $25.43 
Granted3,145 6.57 
Vested(2,021)22.85 
Forfeited(920)33.98 
Unvested — September 30, 2023
6,160 $32.41 2.19$77,547 
Shares expected to vest - September 30, 2023
6,107