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Common Stock and Preferred Stock - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2011
Employee
May 31, 2011
Apr. 30, 2011
Employee
Jun. 30, 2012
Dec. 31, 2011
Jan. 31, 2012
Non-employee directors
Person
Jan. 31, 2011
Non-employee directors
Person
Jun. 30, 2012
Non-employee directors
Person
Mar. 31, 2011
Executive officer
Jan. 31, 2012
Executive officer
Scenario One
Jan. 31, 2011
Executive officer
Scenario One
Jan. 31, 2012
Executive officer
Scenario Two
Feb. 28, 2011
Executive officer
Scenario Two
Mar. 31, 2012
Employees
Person
Mar. 31, 2011
Employees
Person
Jun. 30, 2012
Employees and executive officer
Feb. 28, 2011
Employees and executive officer
Scenario Two
Class of Stock [Line Items]                                  
Common stock, shares authorized       100,000,000 100,000,000 [1]                        
Preferred shares, shares authorized       5,000,000 5,000,000 [1]                        
Total number of shares authorized       105,000,000                          
Common stock, par value       $ 0.001 $ 0.001 [1]                        
Preferred shares, par value       $ 0.001 $ 0.001 [1]                        
Shares of restricted stock issued           34,810 26,480 4,252   35,435 27,442 5,315 18,238       65,363
Shares of restricted stock issued, value           $ 500,000 $ 500,000 $ 100,000   $ 500,000 $ 500,000 $ 100,000 $ 300,000       $ 1,200,000
Vesting period of restricted stock issued                   5 years 6 years 3 years 6 years       3 years
Number of non-employee directors           5 5 2                  
Shares of restricted stock, cancelled                           2,928 5,000    
Number of employees terminated 1   2                     2 1    
Shares of restricted stock, surrendered                 57,096             5,790  
Restricted stock value, surrendered                 1,000,000             100,000  
Exercise of options (in shares)   4,500 5,500 7,500                          
Exercise of options   $ 60,120 $ 73,480                            
Number of Shares, cancelled 13,013   19,362 2,928                          
[1] Derived from audited financial statements