Commitments and Contingencies - Legal (Details) $ in Millions	1 Months Ended		6 Months Ended
	Aug. 31, 2015 USD ($)	Nov. 30, 2014 USD ($)	Jun. 30, 2016 USD ($) lawsuit
Other commitments
Shareholders (as a percent)			5.00%
Number of purported class action lawsuits filed | lawsuit			4
Inventory Material
Other commitments
Purchase commitment			$ 8.7
Tests
Other commitments
Purchase commitment			2.2
Supplier One | Inventory Material
Other commitments
Purchase commitment			8.7
Supplier, Aggregate of Other | Inventory Material
Other commitments
Purchase commitment			$ 3.2
Third-party payer
Other commitments
Amount sought		$ 1.9
Settlement amount	$ 1.2