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Share-Based Compensation - Non-Vested Stock Options (Detail) (USD $)
 6 Months Ended
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Stock Options, Outstanding Beginning Balance 850,000
Number of Stock Options, Granted 0
Options Exercised   
Options Forfeited (850,000)
Number of Stock Options Outstanding, Ending Balance   
Number of Stock Options, Exercisable   
Weighted Average Grant Date Fair Value Outstanding, Beginning Balance $ 0.90
Weighted Average Grant Date Fair Value, Granted   
Weighted Average Grant Date Fair Value, Exercised   
Weighted Average Grant Date Fair Value, Forfeited $ 0.90
Weighted Average Grant Date Fair Value Outstanding, Ending Balance   
Weighted Average Grant Date Fair Value, Exercisable   
Weighted Average Exercise Price Outstanding, Beginning Balance $ 2.20
Weighted Average Exercise Price, Granted $ 2.20
Weighted Average Exercise Price, Exercised   
Weighted Average Exercise Price, Forfeited $ 2.20
Weighted Average Exercise Price Outstanding, Ending Balance   
Weighted Average Exercise Price, Exercisable   
Weighted Average Contractual Life (years), Outstanding, Beginning Balance 10 years
Weighted Average Contractual Life (years), Granted   
Weighted Average Contractual Life (years), Exercised   
Weighted Average Contractual Life (years), Forfeited 10 years
Weighted Average Contractual Life (years), Outstanding, Ending Balance   
Weighted Average Contractual Life (years), Exercisable