Revenue Recognition - Remaining Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, current portion	$ 25,667	$ 4,131
Deferred revenue	81,841	44,189
Deferred revenue, noncurrent	56,174	$ 40,058
Qiagen
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	40,000
Deferred revenue, current portion	2,305
Deferred revenue	38,570
Deferred revenue, noncurrent	36,265
BGI
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, current portion	12,049
Deferred revenue	28,099
Deferred revenue, noncurrent	$ 16,050