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STOCK-BASED COMPENSATION
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATIONThe 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 (Loss) for all stock-based compensation arrangements was as follows: 
Three Months Ended
September 30,
Nine Months Ended
September 30,
2021202020212020
Cost of sales$4,339 $10,342 $16,907 $20,381 
Research and development17,866 15,705 56,199 45,333 
Selling, general and administrative26,821 24,122 80,266 76,411 
Total stock-based compensation expense$49,026 $50,169 $153,372 $142,125