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STOCK-BASED COMPENSATION
3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
The Company has stockholder-approved equity incentive plans that provide for the granting of service-based restricted stock units (RSUs), market-based RSUs, performance-based RSUs, stock options and other types of awards to its employees, officers and non-employee directors. Compensation expense included in the Company’s Condensed Consolidated Statements of Comprehensive Income for all stock-based compensation arrangements was as follows: 
Three Months Ended
March 31,
20222021
Cost of sales$4,326 $6,481 
Research and development17,190 17,517 
Selling, general and administrative26,317 25,505 
Total stock-based compensation expense$47,833 $49,503 
Stock-based compensation of $5.2 million and $4.4 million was capitalized into inventory for the three months ended March 31, 2022 and 2021, respectively. Capitalized stock-based compensation is recognized as cost of sales when the related product is sold.