ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Sales by product	$ 82,500	$ 84,227
% of total net sales	54.50%	53.50%
Abrotose Life [Member] [Member] | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 36,066	$ 34,975
% of total net sales	23.80%	22.20%
Advanced Ambrotose [Member] | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 14,662	$ 22,390
% of total net sales	9.70%	10.30%
TruHealth™ | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 16,263	$ 16,193
% of total net sales	10.70%	14.20%
GI-Pro (MicroBiome) | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 7,513	$ 6,559
% of total net sales	5.00%	4.20%
Optimal Support Packets | Product Concentration Risk
Concentration Risk [Line Items]
Sales by product	$ 7,996	$ 4,110
% of total net sales	5.30%	2.60%