Revenue Recognition - Remaining Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenues	$ 37,309	$ 1,420
Deferred revenue, current portion	1,174	1,420
Deferred revenue	37,309	$ 1,420
Qiagen
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 40,000