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Notes Payable and Advances-Related Parties - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Debt Instrument [Line Items]        
Advance from related party     $ 356 $ 415
Non-cash interest expense $ 56 $ 42 $ 109 $ 79
Related Party
       
Debt Instrument [Line Items]        
Annual interest rate     8.00%