Collaboration and License Agreements - Additional Information (Detail)		1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2022 USD ($)	Nov. 30, 2022	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Units	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue not from contract with customer						$ 251,000
Other receivable current			$ 30,000		$ 30,000		$ 146,000
Option And License Agreement With GC Cell [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of products units for which the option has been exercised by the company | Units					4
Royalty percentage to be paid by the counterparty					50.00%
AB-101 Selected Product License Agreement with GC cell [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty percentage to be paid by the counterparty	50.00%
AB-101 Selected Product License Agreement with GC cell [Member] | Development milestone [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone amount payable	$ 22,000,000
AB-101 Selected Product License Agreement with GC cell [Member] | Sales milestone [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone amount payable	$ 55,000,000
Milestone Amount Recognized					$ 0
Royaly expenses recognized					0
AB-201 Selected Product License Agreement with GC cell [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty percentage to be paid by the counterparty	50.00%
Revenue not from contract with customer			0	$ 0	0	300,000
Accounts receivable net current			0		0		0
AB-201 Selected Product License Agreement with GC cell [Member] | Development milestone [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone amount payable	$ 25,000,000
Milestone payment receivable								$ 1,800,000
AB-201 Selected Product License Agreement with GC cell [Member] | Sales milestone [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone amount payable	$ 55,000,000
AB-205 Selected Product License Agreement with GC cell [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone Amount Recognized					0
Royaly expenses recognized					0
Accounts receivable net current									$ 2,500,000
Research and development expenses reimbursed			0	0	0	100,000
Other receivable current			0		0		$ 0
Receipt from the counterparty			$ 0		0
AB-205 Selected Product License Agreement with GC cell [Member] | Development milestone [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone amount payable									29,500,000
AB-205 Selected Product License Agreement with GC cell [Member] | Sales milestone [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payment receivable									$ 28,000,000
Affimed collaboration agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of costs to be incurred in connection with the performance of confimatory combination		50.00%
Percentage of costs to be borne by the counterparty		50.00%
Revenue share of the company in percentage			67.00%
Revenue share of the counterparty in percentage			33.00%
Expenses incurred in connection with the agreement			$ 17,000	$ 0	37,000	$ 100,000
Termination fee payable					$ 0