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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks, Revenue recognition, Litigation proceeds (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
customer
Jun. 30, 2016
USD ($)
customer
Jun. 30, 2017
USD ($)
customer
item
Jun. 30, 2016
USD ($)
customer
Dec. 31, 2016
USD ($)
Concentration risks          
Number of significant customers | customer 2 1 1 2  
Aggregate dollar amount of net sales to significant customers $ 7,646,117 $ 7,575,053 $ 14,569,797 $ 13,497,035  
Revenue recognition          
Estimated contractual allowance 3,479,252   $ 3,479,252   $ 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%    
Sales | Customer Concentration Risk          
Concentration risks          
Aggregate dollar amount of net sales to significant customers $ 3,100,000 $ 2,800,000 $ 4,100,000 $ 6,100,000  
Percentage of net sales to significant customers (as a percent) 40.20% 37.30% 28.00% 44.90%  
Syringes | Supplier Concentration Risk          
Concentration risks          
Percentage of net sales to significant customers (as a percent) 90.10% 91.80% 89.10% 78.20%