Revenue Recognition - Remaining Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, current portion	$ 4,131	$ 1,420
Deferred revenue	44,189	$ 1,420
Deferred revenue, noncurrent	40,058
Evercord
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, current portion	2,100
Deferred revenue, noncurrent	2,900
Qiagen
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	9,200
Deferred revenue, current portion	2,000
Deferred revenue, noncurrent	$ 37,200