Revenue Recognition - Deferred Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended	51 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Mar. 31, 2023	Dec. 31, 2021
Revenue recognized during the period that was included in deferred revenues at the beginning of the period	$ 3,988	$ 3,889
Deferred revenue, current portion	16,579		$ 10,777	$ 16,579
Deferred revenue, Long-term	21,511		20,001	21,511
Deferred revenue	38,090	$ 34,457	30,778	38,090	$ 28,722
BGI Genomics
Revenue recognized	100		$ 8,500	44,000
Deferred revenue, Long-term	19,800			19,800
Foundation Medicine ("FMI")
Revenue recognized	200
Deferred revenue, current portion	2,400			2,400
Deferred revenue, Long-term	1,700			1,700
BGI Genomics and Foundation Medicine ("FMI")
Revenue recognized during the period that was included in deferred revenues at the beginning of the period	300
Genetic testing services
Revenue recognized during the period that was included in deferred revenues at the beginning of the period	3,700
Deferred revenue, current portion	$ 14,200			$ 14,200