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Summary of Activity under Stock-Based Compensation Plans (Detail) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Shares Available for Grant    
Beginning Balance 7,769,039 10,114,332
Authorized      
Granted (1,352,437) (2,447,033)
Cancelled or Expired 295,889 101,740
Exercised      
Ending Balance 6,712,491 7,769,039
Stock Options Number Outstanding    
Beginning Balance 4,048,972 2,266,821
Granted 1,220,725 2,208,110
Cancelled or Expired (499,888) (425,959)
Exercised (188)   
Ending Balance 4,769,621 4,048,972
Vested or expected to vest at September 30, 2013 4,406,558  
Exercisable at September 30, 2013 2,982,413  
Stock Options Average Exercise Price per share    
Beginning Balance $ 1.94 $ 2.86
Granted $ 0.93 $ 1.17
Cancelled or Expired $ 2.08 $ 2.85
Exercised $ 0.72   
Ending Balance $ 1.67 $ 1.94
Vested or expected to vest at September 30, 2013 $ 1.72  
Exercisable at September 30, 2013 $ 2.02  
Stock Options Aggregate Intrinsic Value    
Beginning Balance $ 825,309 $ 49,298
Ending Balance   825,309
Remaining Contractual Life (in years)    
Beginning Balance 7 years 5 months 5 days 5 years 10 months 24 days
Ending Balance 6 years 8 months 1 day 7 years 5 months 5 days
Vested or expected to vest at September 30, 2013 6 years 6 months 11 days  
Exercisable at September 30, 2013 5 years 7 months 2 days  
Stock Awards Number Granted    
Granted 131,712 238,923
Stock Awards Fair Value    
Granted $ 118,600 $ 419,824