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Subsequent Events (Details) (USD $)
0 Months Ended 1 Months Ended
May 03, 2012
Jan. 31, 2013
Dec. 05, 2012
Common Stock
     
Subsequent events      
Shares of common stock sold upon exercise of full amount of over-allotment option by the underwriters 449,250 239,432  
Selling price (in dollars per share) $ 5 $ 8 $ 8
Subsequent events
     
Subsequent events      
Area of office space (in square feet)   11,900  
Subsequent events | Common Stock
     
Subsequent events      
Shares of common stock sold upon exercise of full amount of over-allotment option by the underwriters   239,432  
Selling price (in dollars per share)   $ 8