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Share-Based Compensation - Summary of Restricted Shares (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares Awarded, Non-vested, Beginning Balance 44,566
Number of Shares Awarded, Vested (8,875)
Number of Shares Awarded, Non-vested, Ending Balance 35,691
Weighted Average Grant Date Fair Value, Non-vested, Beginning Balance $ 1.73
Weighted Average Grant Date Fair Value, Vested $ 1.73
Weighted Average Grant Date Fair Value, Non-vested, Ending Balance $ 1.73