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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, 2019
$ / shares
shares
Activity under the Company's equity incentive plans related to restricted stock units  
Number of Restricted Stock Units Unvested, Beginning Balance | shares 2,001
Granted, Number of Restricted Stock Units Unvested | shares 3,096 [1]
Vested, Number of Restricted Stock Units Unvested | shares (850)
Forfeited, Number of Restricted Stock Units Unvested | shares (55)
Number of Restricted Stock Units Unvested, Ending Balance | shares 4,192
Weighted Average Exercise Price per Share  
Weighted Average Exercise Price per Share, Beginning Balance | $ / shares $ 4.56
Granted, Weighted Average Exercise Price per Share | $ / shares 5.57 [1]
Vested, Weighted Average Exercise Price per Share | $ / shares 4.60
Forfeited, Weighted Average Exercise Price per Share | $ / shares 5.85
Weighted Average Exercise Price per Share, Ending Balance | $ / shares $ 5.28
[1] Includes shares issuable under performance-based restricted stock unit awards.