Revenue Recognition - Deferred Revenues (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Revenue recognized during the period that was included in deferred revenues at the beginning of the period	$ 30,839
Deferred revenue, current portion	10,647	$ 50,125
Deferred revenue, Long-term	23,562	22,805
Deferred revenue	34,209	$ 72,930
BGI Genomics
Deferred revenue, current portion	3,200
Foundation Medicine ("FMI")
Deferred revenue, current portion	5,100
Qiagen
Revenue recognized during the period that was included in deferred revenues at the beginning of the period	$ 28,600