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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2012 item | Dec. 31, 2011 item | Dec. 31, 2010 item
Concentration risks |  |  |
Number of significant customers | 3 | 4 | 3
Concentration risk amount | $ 33,644,503 | $ 32,102,296 | $ 36,219,562
Increase in allowance for doubtful accounts | 107,246 | 1,298,044 | 133,990
Revenue recognition |  |  |
Estimated contractual allowance | 3,036,564 | 2,170,764 |
Period for return of incorrect shipments | 10 days |  |
Number of times overstocking returns are limited | 2 |  |
Period for return of product due to overstock | 12 months |  |
Maximum percentage of distributor's total purchase for the prior 12-month period | 1.00% |  |
Customer concentration risk |  |  |
Concentration risks |  |  |
Increase in allowance for doubtful accounts | 107,000 |  |
Sales | Customer concentration risk |  |  |
Concentration risks |  |  |
Concentration risk amount | $ 13,700,000 | $ 16,200,000 | $ 13,900,000
Concentration risk (as a percent) | 40.60% | 50.60% | 38.60%
Product components | Supplier concentration risk |  |  |
Concentration risks |  |  |
Concentration risk (as a percent) | 72.00% | 67.10% | 64.10%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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