REVENUE (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The Company's revenue by segment payers/customer groups for the years ended December 31, 2019, 2018 and 2017 is as follows:

	For the Year Ended December 31, 2019
	U.S.		Canada		United Kingdom		Switzerland		Other Europe		Other		Total
Payer/Customer
LCD
Clients	16	%	1	%	—	%	—	%	—	%	—	%	17	%
Patients	8	%	—	%	—	%	—	%	—	%	—	%	8	%
Medicare and Medicaid	8	%	—	%	—	%	—	%	—	%	—	%	8	%
Third-party	25	%	2	%	—	%	—	%	—	%	—	%	27	%
Total LCD revenues by payer	57	%	3	%	—	%	—	%	—	%	—	%	60	%
CDD
Biopharmaceutical and medical device companies	21	%	—	%	4	%	5	%	3	%	7	%	40	%
Total revenues	78	%	3	%	4	%	5	%	3	%	7	%	100	%

	For the Year Ended December 31, 2018
	U.S.		Canada		United Kingdom		Switzerland		Other Europe		Other		Total
Payer/Customer
LCD
Clients	17	%	1	%	—	%	—	%	—	%	—	%	18	%
Patients	8	%	—	%	—	%	—	%	—	%	—	%	8	%
Medicare and Medicaid	9	%	—	%	—	%	—	%	—	%	—	%	9	%
Third-party	25	%	2	%	—	%	—	%	—	%	—	%	27	%
Total LCD revenues by payer	59	%	3	%	—	%	—	%	—	%	—	%	62	%
CDD
Biopharmaceutical and medical device companies	19	%	—	%	4	%	5	%	3	%	7	%	38	%
Total revenues	78	%	3	%	4	%	5	%	3	%	7	%	100	%

	For the Year Ended December 31, 2017
	U.S.		Canada		United Kingdom		Switzerland		Other Europe		Other		Total
Payer/Customer
LCD
Clients	19	%	1	%	—	%	—	%	—	%	—	%	20	%
Patients	8	%	—	%	—	%	—	%	—	%	—	%	8	%
Medicare and Medicaid	10	%	—	%	—	%	—	%	—	%	—	%	10	%
Third-party	27	%	2	%	—	%	—	%	—	%	—	%	29	%
Total LCD revenues by payer	64	%	3	%	—	%	—	%	—	%	—	%	67	%
CDD
Biopharmaceutical and medical device companies	15	%	—	%	3	%	5	%	3	%	7	%	33	%
Total revenues	79	%	3	%	3	%	5	%	3	%	7	%	100	%