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Changes in Non-Vested Shares of Restricted Common Stock (Detail) (Restricted Stock, USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Restricted Stock
   
Weighted Average Grant Date Fair Value per share    
Nonvested restricted common stock, beginning balance $ 0.44 $ 0.60
Shares Vested $ 0.35 $ 0.42
Shares granted $ 0.49 $ 0.31
Nonvested restricted common stock, ending balance $ 0.49 $ 0.44
Number of shares    
Beginning nonvested shares 3,575,182 2,315,040
Shares vested (1,410,984) (1,950,102)
Shares granted 1,231,708 3,210,244
Ending nonvested shares 3,395,906 3,575,182