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Accrued Expenses and Other Current Liabilities (Tables)
9 Months Ended
Sep. 30, 2012
Accrued Expenses and Other Current Liabilities [Abstract]  
Accrued expenses
                 
    December 31,     September 30,  
    2011     2012  
          (Unaudited)  

Accrued stockholder interest

  $ 27,906     $ 16,406  

Accrued compensation

    310,500       445,672  

Accrued warranty

    135,708       157,915  

Accrued inventory purchases

    59,577       52,038  

Customer deposits

    135,597       18,940  

Deferred rent

    25,341       63,592  

Deferred revenue

    260,638       290,796  

Accrued taxes and other

    155,671       134,351  
   

 

 

   

 

 

 
    $ 1,110,938     $ 1,179,710