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Summary of Option Activity (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 07, 2010
Independent Directors
Jan. 20, 2010
Independent Directors
Oct. 30, 2009
Independent Directors
Jun. 30, 2012
Independent Directors
Jun. 30, 2011
Independent Directors
Jun. 30, 2012
Independent Directors
Jun. 30, 2011
Independent Directors
Nov. 11, 2009
Employee Stock Option
Jun. 30, 2012
Employee Stock Option
Jun. 30, 2011
Employee Stock Option
Jun. 30, 2012
Employee Stock Option
Jun. 30, 2011
Employee Stock Option
Dec. 31, 2011
Employee Stock Option
Number of shares                          
Outstanding, beginning balance           210,000         4,466,667    
Exercisable, beginning balance           210,000         3,675,333    
Granted 40,000 40,000 130,000          290,000           
Exercised       0 0 0 0   0 0 0 0  
Forfeited                           2,200,000
Outstanding, ending balance       210,000   210,000     4,466,667   4,466,667   4,466,667
Exercisable ending balance       210,000   210,000     3,675,333   3,675,333   3,675,333
Average Exercise Price per Share                          
Outstanding, beginning balance           $ 2.60         $ 1.64    
Exercisable, beginning balance           $ 2.60         $ 1.35    
Granted   $ 4.68 $ 1.85          $ 2.35           
Exercised                            
Forfeited                            
Outstanding, ending balance       $ 2.60   $ 2.60     $ 1.64   $ 1.64   $ 1.64
Exercisable, ending balance       $ 2.60   $ 2.60     $ 1.35   $ 1.35   $ 1.35
Weighed Average Remaining Contractual Term in Years                          
Outstanding, beginning balance           3 years 18 days         2 years 4 months 2 days    
Outstanding, ending balance       2 years 6 months 18 days   2 years 6 months 18 days     1 year 10 months 2 days   1 year 10 months 2 days   2 years 4 months 2 days
Exercisable, ending balance           2 years 6 months 18 days         1 year 6 months 26 days