ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Sales by product	$ 96,347	$ 85,367
% of total net sales	54.50%	47.40%
Advanced Ambrotose® | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 52,592	$ 55,863
% of total net sales	29.80%	31.00%
TruHealth™ | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 16,652	$ 9,220
% of total net sales	9.40%	5.10%
Manapol® Powder | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 11,183	$ 2,153
% of total net sales	6.30%	1.20%
Ambrotose® | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 8,459	$ 10,196
% of total net sales	4.80%	5.70%
PLUS ™ | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 7,461	$ 7,935
% of total net sales	4.20%	4.40%