Schedule I - Parent Company Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 181,905	$ 178,595	$ 265,418	$ 237,577	$ 185,340	$ 179,744	$ 309,893	$ 329,219	$ 863,495	$ 1,004,196	$ 1,774,718
Costs and expenses:
Selling, general and administrative									300,559	372,672	468,857
Research and development									89,593	73,887	76,850
Gain on sale of GeneDx									0	(18,559)	(31,508)
Total costs and expenses	250,949	243,002	258,393	268,171	240,610	267,564	320,632	401,643	1,020,516	1,230,449	1,755,968
Operating income (loss)									(157,021)	(226,253)	18,750
Other income and (expense), net:
Fair value changes of derivative instruments, net									(781)	649	846
Other income (expense), net									(16,994)	(155,842)	(14,769)
Other expense, net									(27,298)	(165,268)	(32,775)
Loss before income taxes and investment losses									(184,319)	(391,521)	(14,025)
Income tax provision									(4,437)	63,499	(15,489)
Loss from investments in investees									(107)	(383)	(629)
Net loss	$ (66,483)	$ (84,473)	$ (19,640)	$ (18,267)	$ (85,231)	$ (86,091)	$ (101,650)	$ (55,433)	(188,863)	(328,405)	(30,143)
Parent Company [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Costs and expenses:
Costs of revenue									739	2,347	1,279
Selling, general and administrative									46,359	46,882	66,483
Research and development									4,106	4,196	2,029
Gain on sale of GeneDx									0	(18,559)	0
Total costs and expenses									51,204	34,866	69,791
Operating income (loss)									(51,204)	(34,866)	(69,791)
Other income and (expense), net:
Interest income									2,499	1,762	334
Interest expense									(12,460)	(13,688)	(21,297)
Fair value changes of derivative instruments, net									(26)	12	(58)
Other income (expense), net									(16,593)	(154,807)	(9,013)
Other expense, net									(26,580)	(166,721)	(30,034)
Loss before income taxes and investment losses									(77,784)	(201,587)	(99,825)
Income tax provision									(19)	(10)	(2)
Net loss before investments and loss from subsidiaries									(77,803)	(201,597)	(99,827)
Loss from investments in investees									(107)	(383)	(629)
Net income (loss) from subsidiaries, net of taxes									(110,953)	(126,425)	70,313
Net loss									$ (188,863)	$ (328,405)	$ (30,143)