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Common Stock and Preferred Stock - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended 1 Months Ended
Jan. 31, 2013
Director
ExecutiveOfficers
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Restricted Stock
Minimum
Jun. 30, 2013
Restricted Stock
Maximum
Jan. 31, 2013
Executive officer
Jan. 31, 2013
Executive officer
Restricted Stock
Minimum
Jan. 31, 2013
Executive officer
Restricted Stock
Maximum
Jan. 31, 2013
Non-employee directors
Jan. 31, 2013
Non-employee directors
Restricted Stock
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]              
Restricted stock issued, shares           285,543     54,227  
Restricted stock issued, value           $ 3.6     $ 0.7  
Vesting period       1 year 5 years   1 year 3 years    
Number of executive officers 2                  
Number of non-employee directors 7                  
Shares of restricted stock, vesting date                   2014-01
[1] Derived from audited financial statements