Revenue Recognition - Remaining Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, current portion	$ 19,154	$ 4,131
Deferred revenue	79,681	44,189
Deferred revenue, noncurrent	60,527	$ 40,058
Qiagen
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	40,000
Deferred revenue, current portion	1,963
Deferred revenue	38,531
Deferred revenue, noncurrent	36,568
BGI
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, current portion	15,000
Deferred revenue	34,982
Deferred revenue, noncurrent	19,982
IVD kits and genetic testing services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, current portion	2,191
Deferred revenue	6,168
Deferred revenue, noncurrent	$ 3,977