Commitments and Contingencies - Legal (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) item
Other commitments
Shareholders (as a percent)	5.00%
Number of third-party payers that have alleged to have overpaid the company | item	3
Inventory material
Other commitments
Purchase commitment	$ 6.7
Other supplier commitments | Inventory material
Other commitments
Purchase commitment	2.1
Supplier two | Inventory material
Other commitments
Purchase commitment	2.0
Supplier Four | Biological Sample Processing and Storage
Other commitments
Purchase commitment	2.6
Securities related claims
Other commitments
Estimate of possible loss	1.5
Commercial general liability claims
Other commitments
Estimate of possible loss	$ 0.3