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Stock Incentive Plans and Stock-Based Compensation - Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs)
shares in Thousands
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Shares  
Beginning Balance | shares 7,710
Granted | shares 7,725
Vested | shares (4,057)
Forfeited | shares (2,101)
Ending Balance | shares 9,277
Weighted Average Grant-Date Fair Value  
Beginning Balance | $ / shares $ 9.67
Granted | $ / shares 5.07
Vested | $ / shares 5.98
Forfeited | $ / shares 8.57
Ending Balance | $ / shares $ 7.70