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Activity Under Equity Incentive Plans Related to RSUs (Detail) - 2008 Equity Incentive Plan - Restricted Stock Units (RSUs)
shares in Thousands
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Activity under the Company's equity incentive plans related to restricted stock units  
Number of Restricted Stock Units Outstanding, Beginning Balance | shares 739
Granted, Number of Restricted Stock Units Outstanding | shares 835 [1]
Forfeited, Number of Restricted Stock Units Outstanding | shares (22)
Vested, Number of Restricted Stock Units Outstanding | shares (198)
Number of Restricted Stock Units Outstanding, Ending Balance | shares 1,354
Weighted Average Exercise Price per Share  
Weighted Average Exercise Price per Share, Beginning Balance | $ / shares $ 5.26
Granted, Weighted Average Exercise Price per Share | $ / shares 4.33 [1]
Forfeited, Weighted Average Exercise Price per Share | $ / shares 4.97
Vested, Weighted Average Exercise Price per Share | $ / shares 5.06
Weighted Average Exercise Price per Share, Ending Balance | $ / shares $ 4.72
[1] Includes the maximum number of shares issuable under the performance-based restricted stock unit awards granted during the three months ended March 31, 2017.