SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Risk (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) customer	Sep. 30, 2015 USD ($) customer	Sep. 30, 2016 USD ($) customer item	Sep. 30, 2015 USD ($) customer	Dec. 31, 2015 USD ($)
Concentration risks
Number of significant customers | customer	2	2	1	2
Aggregate dollar amount of net sales to significant customers	$ 8,840,134	$ 9,482,866	$ 22,337,169	$ 22,376,912
Revenue recognition
Estimated contractual allowance	3,998,904		3,998,904		$ 3,733,199
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	$ 3,500,000	$ 5,100,000	$ 7,100,000	$ 10,300,000
Percentage of net sales to significant customers (as a percent)	39.30%	53.50%	31.60%	46.00%
Syringes | Supplier Concentration Risk
Concentration risks
Percentage of net sales to significant customers (as a percent)	92.70%	82.40%	85.10%	78.20%