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Accrued Expenses
 6 Months Ended
Jun. 30, 2011
Accrued Expenses [Abstract]  
Accrued Expenses
5. Accrued Expenses
Accrued expenses consisted of the following:
                 
    December 31,     June 30,  
    2010     2011  
          (Unaudited)  
Accrued compensation
  $ 207,189     $ 316,445  
Accrued warranty
    155,918       172,583  
Accrued inventory purchases
    75,983       4,019  
Customer deposits
    57,164       74,133  
Deferred rent
    15,386       25,249  
Accrued taxes and other
    191,081       273,296  
 
           
 
  $ 702,721     $ 865,725