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Loans Payable - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Term loan, entered on March 31, 2011
Dec. 31, 2011
Term loan, entered on March 31, 2011
Jun. 30, 2012
Term loan, entered on June 10, 2011
Dec. 31, 2011
Term loan, entered on June 10, 2011
Debt Disclosure [Line Items]                  
Short-term bank loans $ 2,771,487   $ 2,771,487   $ 2,833,619        
Accounts receivable used to secure debt 3,053,734   3,053,734   3,820,696        
Short-term borrowing, average interest rates 8.76% 6.07% 8.15% 5.85%          
Loan from credit union 5,725,100   5,725,100   5,690,852        
Loan, issuance date           Mar. 31, 2011   Jun. 10, 2011  
Loan agreement amount 1,559,951   1,559,951   5,690,852   1,550,619   4,140,233
Loan, term           3 years 3 years    
Loan agreement, interest rate per month           0.72% 0.72% 0.72% 0.72%
Manufacturing equipment, used as a security for loan agreement               10,009,274 10,646,244
Loan, maturity date               Jun. 09, 2013  
Current portion of long-term loan from credit union 4,165,149   4,165,149            
Interest expenses for short-term bank loans and long-term loan $ 186,959 $ 73,504 $ 357,973 $ 141,190