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Organization and Summary of Significant Accounting Policies - Revenue by Type (Details) - USD ($) $ in Millions	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 154.6	$ 145.2	$ 93.2	$ 164.0	$ 195.1	$ 186.3	$ 215.4	$ 216.6	$ 216.8	$ 202.3	$ 299.8	$ 381.4	$ 638.6	$ 851.1	$ 743.7
Molecular diagnostic testing
Disaggregation of Revenue [Line Items]
Total revenue	143.9	135.7	83.3	150.5	181.1	172.0	196.9	200.5	203.0	189.0	279.6	353.1	586.9	789.4	690.4
Molecular diagnostic - Hereditary Cancer Testing
Disaggregation of Revenue [Line Items]
Total revenue											159.3		347.4	479.7	471.4
Molecular diagnostic - GeneSight
Disaggregation of Revenue [Line Items]
Total revenue											29.8		74.1	112.6	124.9
Molecular diagnostic - Prenatal
Disaggregation of Revenue [Line Items]
Total revenue											37.6		76.7	104.9	0.0
Molecular diagnostic - Vectra
Disaggregation of Revenue [Line Items]
Total revenue											18.0		39.1	48.3	55.2
Molecular diagnostic - myChoice CDx
Disaggregation of Revenue [Line Items]
Total revenue											13.2		13.1	7.1	5.1
Molecular diagnostic - Prolaris
Disaggregation of Revenue [Line Items]
Total revenue											14.8		24.7	25.5	21.5
Molecular diagnostic - EndoPredict
Disaggregation of Revenue [Line Items]
Total revenue											5.9		10.5	10.4	8.8
Molecular diagnostic - Other
Disaggregation of Revenue [Line Items]
Total revenue											1.0		1.3	0.9	3.5
Pharmaceutical and clinical services
Disaggregation of Revenue [Line Items]
Total revenue	$ 10.7	$ 9.5	$ 9.9	$ 13.5	$ 14.0	$ 14.3	$ 18.5	$ 16.1	$ 13.8	$ 13.3	$ 20.2	$ 28.3	$ 51.7	$ 61.7	$ 53.3

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