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Summary of RSA Activity (Detail) (USD $)
 1 Months Ended 3 Months Ended
Dec. 28, 2011
Dec. 31, 2013
Restricted Stock
Sep. 30, 2013
Restricted Stock
Jun. 30, 2013
Restricted Stock
Number of shares        
Unvested number of shares beginning balance   1,476,000 1,513,000 2,632,000
Granted 3,170 86,000 0 168,000
Canceled           
Vested   (109,000) (37,000) (1,287,000)
Unvested number of shares ending balance   1,453,000 1,476,000 1,513,000
Weighted average exercise price        
Unvested weighted average grant date fair value beginning balance   $ 3.32 $ 3.34 $ 3.27
Granted   $ 2.79 $ 0 $ 4.16
Canceled           
Vested   $ 3.48 $ 4.18 $ 3.31
Unvested weighted average grant date fair value ending balance   $ 3.27 $ 3.32 $ 3.34