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Activity Under Equity Incentive Plans Related to Restricted Stock Units (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Number of RSUs      
Granted $ 2.03 $ 2.13 $ 1.37
Restricted Stock Units Rsus
      
Number of RSUs      
Beginning Balance 16,645 33,295 88,400
Granted   2,000  
Forfeited     (17,727)
Vested (16,645) (18,650) (37,378)
Ending Balance   16,645 33,295
Restricted Stock
      
Number of RSUs      
Beginning Balance $ 1.85 $ 1.85 $ 2.54
Granted $ 0.00 $ 3.03 $ 0.00
Forfeited $ 0.00 $ 0.00 $ 1.85
Vested $ 1.85 $ 1.98 $ 3.48
Ending Balance   $ 1.85 $ 1.85