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STOCK-BASED COMPENSATION PLANS (Tables)
3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Activity Related to Unvested Restricted Stock Grants
The activity related to the Company's RSUs for the three months ended March 31, 2023 was as follows:
SharesWeighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 20237,649,747 $3.96 
Granted853,981 $3.37 
Vested(1,020,277)$5.02 
Forfeited(399,136)$4.05 
Unvested balance at March 31, 20237,084,315 $3.74 
Schedule of Activity Related to Performance Stock Awards
The activity related to the Company's PSUs for the three months ended March 31, 2023 was as follows:
SharesWeighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 20236,653,503 $2.52 
Granted27,153 $4.27 
Vested(381,071)$5.40 
Forfeited(1,667,550)$3.93 
Unvested balance at March 31, 20234,632,035 $1.66 
Schedule of Stock-based Compensation Expenses Which Are Included in Condensed Consolidated Statement of Operations
The condensed consolidated statements of operations include stock-based compensation for the three months ended March 31, 2023 and 2022 as follows (in thousands):
 Three months ended
 March 31,
2023
March 31,
2022
Product cost of revenue$149 $99 
Service cost of revenue535 481 
Research and development1,262 1,206 
Sales and marketing2,129 1,371 
General and administrative1,773 1,098 
$5,848 $4,255