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Lease Commitments - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Leases Disclosure [Line Items]      
Noncancelable lease agreement, expiration year     2015
Lease office space under sublease agreements, renewal period 1 year    
Future minimum rental payments under noncancelable operating lease in 2014 $ 15,000    
Future minimum rental payments under noncancelable operating lease in 2015 4,000    
Rental expense $ 27,000 $ 25,000