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Activity Under Equity Incentive Plans Related to RSUs (Detail) - 2008 Equity Incentive Plan - Restricted Stock Units
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Activity under the Company's equity incentive plans related to restricted stock units  
Number of Restricted Stock Units Unvested, Beginning Balance | shares 5,739
Granted, Number of Restricted Stock Units Unvested | shares 3,659 [1]
Vested, Number of Restricted Stock Units Unvested | shares (2,476) [1]
Forfeited, Number of Restricted Stock Units Unvested | shares (143)
Number of Restricted Stock Units Unvested, Ending Balance | shares 6,779
Weighted Average Exercise Price per Share  
Weighted Average Exercise Price per Share, Beginning Balance | $ / shares $ 5.24
Granted, Weighted Average Exercise Price per Share | $ / shares 6.48 [1]
Vested, Weighted Average Exercise Price per Share | $ / shares 5.21 [1]
Forfeited, Weighted Average Exercise Price per Share | $ / shares 5.77
Weighted Average Exercise Price per Share, Ending Balance | $ / shares $ 5.91
[1] Includes shares issuable under performance-based restricted stock unit awards.