Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Mar. 31, 2020 USD ($)	Mar. 26, 2019 claim
Other commitments
Shareholders (as a percent)	5.00%
Total commitments		$ 37,223
Laboratory instruments supplier
Other commitments
Total commitments		6,683
Material supplier
Other commitments
Total commitments		10,375
Application service provider
Other commitments
Total commitments		9,778
Gene sequencing reagents and kits
Other commitments
Total commitments		675
Other material supplier
Other commitments
Total commitments		9,712
Securities related claims
Other commitments
Estimate of possible loss		1,500
Commercial general liability claims
Other commitments
Estimate of possible loss		$ 300
CareDX's Patent Case
Other commitments
Number of claims | claim			2