Revenue Recognition - Deferred Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Revenue recognized during the period that was included in deferred revenues at the beginning of the period	$ 30,292
Deferred revenue, current portion	9,069	$ 50,125
Deferred revenue, Long-term	23,816	22,805
Deferred revenue	32,885	$ 72,930
BGI Genomics
Deferred revenue, current portion	3,200
Foundation Medicine ("FMI")
Deferred revenue, current portion	4,200
Qiagen
Revenue recognized during the period that was included in deferred revenues at the beginning of the period	$ 28,600