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Public Offerings - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Nov. 30, 2012
Feb. 29, 2012
Dec. 31, 2012
Dec. 31, 2011
Public Offerings [Abstract]        
Public offering of common stock per share amount $ 6.10 $ 5.61    
Shares sold by company   1,000,000    
Number of shares sold by stockholders 27,795,630 15,516,587    
Proceeds after commissions and other direct selling expenses   $ 4,329 $ 4,329  
Sale of Stock, Consideration Received on Transaction 0      
Proceeds from Existing Shareholders on Sale 0      
Expenses related to offering     $ 353 $ 729