Commitments and Contingencies (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Mar. 26, 2019 claim
Other commitments
Shareholders (as a percent)		5.00%
Settlement agreement installment paid	$ 1,400
Laboratory instruments supplier
Other commitments
Total commitments		$ 10,679
Material supplier
Other commitments
Total commitments		8,495
Application service provider
Other commitments
Total commitments		1,964
Gene sequencing reagents and kits provider
Other commitments
Total commitments		1,148
Specimen samples provider
Other commitments
Total commitments		300
Biological sample processing and storage provider
Other commitments
Total commitments		250
Other material supplier
Other commitments
Total commitments		6,598
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