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Summary of Restricted Stock Units Activity (Detail) (Restricted Stock Units (RSUs), USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Restricted Stock Units (RSUs)
 
Number of shares  
Beginning Balance 1,755
Granted 250
Vested   
Forfeited or expired (230)
Ending Balance 1,775
Weighted Average Grant Date Fair Value  
Beginning Balance $ 4.23
Granted $ 1.23
Vested   
Forfeited or expired $ 4.23
Ending Balance $ 3.81