Impact of COVID-19 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Genomic Test
Unusual or Infrequent Item, or Both [Line Items]
Change in testing volume (as a percent)	26.40%
Routine Clinical Test
Unusual or Infrequent Item, or Both [Line Items]
Change in testing volume (as a percent)	6.90%
Services
Unusual or Infrequent Item, or Both [Line Items]
Increase (decrease) in revenues	$ 344.9
CMS Accelerated and Advanced Payment Program, COVID-19
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from issuance of debt		$ 14.0
Distribution to Healthcare Providers, COVID-19
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from issuance of debt		16.2
Distribution to Healthcare Providers, COVID-19 | Revenue from transfer of intellectual property and other
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from issuance of debt		$ 16.2