Collaboration and License Agreements (Tables)

12 Months Ended

Dec. 31, 2022

Collaboration Agreement [Member] | Bluebird bio to 2seventy [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Schedule of Changes in Deferred Revenue Balance

Changes in the deferred revenue balance during the year ended December 31, 2022 are as follows (in thousands):

	Deferred Revenue
Balance at December 31, 2021	$	8,725
Additions		—
Deductions		(7,678	)
Balance at December 31, 2022	$	1,047

Grant Agreement [Member] | Gates Foundation [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Schedule of Changes in Deferred Revenue Balance

Changes in the short-term deferred revenue, balance during the year ended December 31, 2022 for the Grant Agreement are as follows (in thousands):

	Deferred Revenue
Balance at December 31, 2021	$	2,225
Additions		—
Deductions		(1,200	)
Balance at December 31, 2022	$	1,025

Gilead [Member] | Collaboration, Option and License Agreement [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Schedule of Changes in Deferred Revenue Balance

Changes in the contract asset and short-term deferred revenue, balance during the year ended December 31, 2022 for the Gilead Collaboration Agreement are as follows (in thousands):

	Contract Asset			Deferred Revenue
Balance at December 31, 2021	$	1,385		$	—
Additions		123			122
Deductions		(1,508	)		(15	)
Balance at December 31, 2022	$	—		$	107

CEPI [Member] | Funding Agreement [Member]

Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]

Schedule of Changes in Deferred Revenue Balance

Changes in the short-term deferred revenue, balance during the year ended December 31, 2022 for the CEPI Funding Agreement are as follows (in thousands):

	Deferred Revenue
Balance at December 31, 2021	$	9,379
Additions		2,698
Deductions		(9,125	)
Balance at December 31, 2022	$	2,952