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Prepaid Expenses and Other Current Assets (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Prepaid Expenses [Abstract]    
Advance payment to suppliers $ 362,718 $ 290,373
Prepaid income taxes 0 76,557
Certificates of deposit - restricted 83,419 83,598
Prepaid insurance and other 491,167 172,760
Prepaid expenses and other current assets $ 937,304 $ 623,288