Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues [Abstract]
Total revenues	$ 2,765	$ 1,408	$ 4,267	$ 2,852
OPERATING EXPENSES:
Cost of royalties	39	44	75	142
Research and development	3,106	2,868	6,220	5,878
General and administrative	4,560	4,363	9,417	9,360
Loss on impairment of intangible asset (Note 6 and Note 13)	14,840	0	14,840	0
Total operating expenses	22,545	7,275	30,552	15,380
Loss from operations	(19,780)	(5,867)	(26,285)	(12,528)
OTHER INCOME (EXPENSES):
Interest income, net	454	463	932	925
Loss on marketable equity securities, net	(2)	(10)	(7)	(15)
Change in fair value of warrant liability	(12,740)	0	(10,435)	0
Foreign currency transaction gain (loss), net	1,678	(378)	1,447	(732)
Other income (expense), net	26	19	(159)	19
Total other income (expenses)	(10,584)	94	(8,222)	197
NET LOSS	(30,364)	(5,773)	(34,507)	(12,331)
Net (income) loss attributable to noncontrolling interest	(100)	13	(96)	29
NET LOSS ATTRIBUTABLE TO LINEAGE	$ (30,464)	$ (5,760)	$ (34,603)	$ (12,302)
Net loss per common share attributable to Lineage basic	$ (0.13)	$ (0.03)	$ (0.15)	$ (0.07)
Net loss per common share attributable to Lineage diluted	$ (0.13)	$ (0.03)	$ (0.15)	$ (0.07)
Weighted-average common shares used to compute net loss per common share, basic	228,356	188,813	227,212	185,861
Weighted-average common shares used to compute net loss per common share, diluted	228,356	188,813	227,212	185,861
Collaboration Revenues [Member]
Revenues [Abstract]
Total revenues	$ 2,532	$ 1,098	$ 3,802	$ 2,285
Royalties, License and Other Revenues [Member]
Revenues [Abstract]
Total revenues	$ 233	$ 310	$ 465	$ 567