Revenue Recognition - Deferred Revenues (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred revenue, current portion	$ 19,154	$ 4,131
Deferred revenue, noncurrent	60,527	40,058
Total deferred revenues	79,681	$ 44,189
BGI
Deferred revenue, current portion	15,000
Deferred revenue, noncurrent	19,982
Total deferred revenues	34,982
Qiagen
Deferred revenue, current portion	1,963
Deferred revenue, noncurrent	36,568
Total deferred revenues	38,531
IVD kits and genetic testing services
Deferred revenue, current portion	2,191
Deferred revenue, noncurrent	3,977
Total deferred revenues	$ 6,168