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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of allocation of stock-based compensation
Presented below are the components of total share-based compensation as recorded in our Consolidated Statements of Operations for the years ended December 31, 2021, 2020 and 2019 (in thousands).
202120202019
Selling, general and administrative expenses$23,400 $32,368 $44,159 
Research and development expenses1,378 2,504 4,501 
Cost of revenues5,268 6,485 10,482 
Total share-based compensation expense$30,046 $41,357 $59,142 
Schedule of activity under stock incentive plans
A summary of the activity for each of the years ended December 31, 2021, 2020 and 2019 is presented below:
Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual TermAggregate Intrinsic Value (1)
Outstanding as of December 31, 20188,072,718 $20.62 
Exercised(557)$7.55 
Forfeited(125,739)$14.38 
Expired(665,883)$40.37 
Outstanding as of December 31, 20197,280,539 $18.93 
Forfeited(16,953)$11.81 
Expired(347,000)$35.56 
Outstanding as of December 31, 20206,916,586 $18.11 
Exercised(82,331)$7.55 
Forfeited(11,887)$13.19 
Expired(438,454)$40.76 
Outstanding as of December 31, 20216,383,914 $16.70 4.07$— 
Vested and expected to vest as of December 31, 20216,383,914 $16.70 4.07$— 
Exercisable as of December 31, 20216,383,914 $16.70 4.07$— 
__________
(1)The intrinsic value of a stock option is the excess, if any, of the closing price of the Company’s ordinary shares on the last trading day of the fiscal year over the exercise price. The aggregate intrinsic values presented in the table above represent sum of the intrinsic values of all corresponding stock options that are “in-the-money,” if any.
Schedule of restricted and performance stock units activity
A summary of our non-vested RSUs and PSUs for the years ended December 31, 2021, 2020 and 2019 is presented below:
Number of SharesAggregate Intrinsic Value (1)
Non-vested as of December 31, 201811,019,472 
Granted6,687,695 
Forfeited(918,425)
Vested(3,872,453)
Non-vested as of December 31, 201912,916,289 
Granted3,761,648 
Forfeited(824,299)
Vested(5,513,359)
Non-vested as of December 31, 202010,340,279 
Granted4,483,385 
Forfeited(1,302,292)
Vested(5,380,262)
Non-vested as of December 31, 20218,141,110 $30,610,574 
Vested and expected to vest as of December 31, 20217,547,762 $28,379,585 
__________
(1)The aggregate intrinsic values presented in the table above were calculated by multiplying the closing price of the Company’s ordinary shares on the last trading day of the fiscal year by the corresponding quantities above.