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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks, Revenue recognition, Litigation proceeds (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
customer
item
Mar. 31, 2016
USD ($)
customer
Dec. 31, 2016
USD ($)
Concentration risks      
Number of significant customers | customer 3 3  
Aggregate dollar amount of net sales to significant customers $ 6,923,680 $ 5,921,982  
Revenue recognition      
Estimated contractual allowance 3,294,192   $ 3,591,534
Change to reserve regarding non-contractual rebates $ 0    
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%    
Sales | Customer Concentration Risk      
Concentration risks      
Aggregate dollar amount of net sales to significant customers $ 3,700,000 $ 3,100,000  
Percentage of net sales to significant customers (as a percent) 53.20% 52.60%  
Syringes | Supplier Concentration Risk      
Concentration risks      
Percentage of net sales to significant customers (as a percent) 90.50% 58.40%