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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue recognized	$ 456,379	$ 408,363	$ 1,293,275	$ 1,025,052
Screening
Disaggregation of Revenue [Line Items]
Revenue recognized	280,378	214,623	784,643	565,407
Screening | Medicare Parts B & C
Disaggregation of Revenue [Line Items]
Revenue recognized	116,088	98,847	329,034	256,589
Screening | Commercial
Disaggregation of Revenue [Line Items]
Revenue recognized	151,245	106,002	419,268	280,451
Screening | Other
Disaggregation of Revenue [Line Items]
Revenue recognized	13,045	9,774	36,341	28,367
Precision Oncology
Disaggregation of Revenue [Line Items]
Revenue recognized	145,412	91,579	412,628	322,905
Precision Oncology | Medicare Parts B & C
Disaggregation of Revenue [Line Items]
Revenue recognized	51,607	33,945	142,428	114,973
Precision Oncology | Commercial
Disaggregation of Revenue [Line Items]
Revenue recognized	42,844	37,402	145,821	137,212
Precision Oncology | International
Disaggregation of Revenue [Line Items]
Revenue recognized	27,229	16,243	80,133	56,227
Precision Oncology | Other
Disaggregation of Revenue [Line Items]
Revenue recognized	23,732	3,989	44,246	14,493
COVID-19 Testing
Disaggregation of Revenue [Line Items]
Revenue recognized	$ 30,589	$ 102,161	$ 96,004	$ 136,740

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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