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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks, Revenue recognition, Litigation proceeds & Income taxes(Details) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) item
Concentration risks |  |  |  |
Number of significant customers | item |  | 2 | 1 | 2
Aggregate dollar amount of net sales to significant customers |  | $ 34,493,838 | $ 29,826,636 | $ 29,552,200
Revenue recognition |  |  |  |
Estimated contractual allowance |  | $ 4,115,628 | $ 3,591,534 |
Period for return of incorrect shipments |  | 10 days |  |
Number of times overstocking returns are limited | item |  | 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% |  |
Income taxes |  |  |  |
Income tax at the federal statutory rate (as a percent) |  | 35.00% | 35.00% | 35.00%
Customer Concentration Risk |  |  |  |
Concentration risks |  |  |  |
Decrease in allowance for doubtful accounts |  |  | $ 1,600,000 |
Forecast |  |  |  |
Income taxes |  |  |  |
Income tax at the federal statutory rate (as a percent) | 21.00% |  |  |
Sales | Customer Concentration Risk |  |  |  |
Concentration risks |  |  |  |
Aggregate dollar amount of net sales to significant customers |  | $ 14,000,000 | $ 9,400,000 | $ 13,500,000
Percentage of net sales to significant customers (as a percent) |  | 40.50% | 31.40% | 45.70%
Cost of Goods, Product Line | Supplier Concentration Risk |  |  |  |
Concentration risks |  |  |  |
Percentage of net sales to significant customers (as a percent) |  | 90.40% | 86.30% | 77.70%

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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=84177426&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 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 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=84177426&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 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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