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Activity Under Equity Incentive Plans Related to RSUs (Detail) - 2008 Equity Incentive Plan - Restricted Stock Units
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Activity under the Company's equity incentive plans related to restricted stock units  
Number of Restricted Stock Units Unvested, Beginning Balance | shares 4,098
Granted, Number of Restricted Stock Units Unvested | shares 3,433 [1]
Vested, Number of Restricted Stock Units Unvested | shares (1,631) [1]
Forfeited, Number of Restricted Stock Units Unvested | shares (161) [1]
Number of Restricted Stock Units Unvested, Ending Balance | shares 5,739
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 5.17 [1]
Vested, Weighted Average Exercise Price per Share | $ / shares 5.05 [1]
Forfeited, Weighted Average Exercise Price per Share | $ / shares 5.73 [1]
Weighted Average Exercise Price per Share, Ending Balance | $ / shares $ 5.24
[1] Includes shares issuable under performance-based restricted stock unit awards.