Related Party Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Mar. 15, 2023	Mar. 13, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Sep. 11, 2023	Dec. 31, 2020
Related Party Transaction [Line Items]
Common stock, Shares issued			29,352,140		29,352,140		14,817,696	11,021,248
Common stock, Par value			$ 0.001		$ 0.001		$ 0.001
Unbilled receivable from related party			$ 835		$ 835		$ 184
Deferred revenue current			100		100		100
Deferred revenue noncurrent			682		682		736
Aggregate principal amount					0	$ 377
Principal and interest repaid					0	377
Zenas BioPharma Limited [Member]
Related Party Transaction [Line Items]
Common stock, Shares issued									156,848
Related party receivable			800		800		300
Unbilled receivable from related party			800		800		200
Deferred revenue current			100		100		100
Deferred revenue noncurrent			$ 700		$ 700		$ 700
Zenas BioPharma Limited [Member] | Dianthus [Member]
Related Party Transaction [Line Items]
Aggregate principal amount		$ 400
Interest rate		4.50%
Zenas BioPharma Limited [Member] | Tellus Bioventures Llc [Member]
Related Party Transaction [Line Items]
Percentage of outstanding shares			5.00%		5.00%
Zenas BioPharma Limited [Member] | Fairmount Funds [Member]
Related Party Transaction [Line Items]
Percentage of outstanding shares			9.00%		9.00%
Principal and interest repaid	$ 400
License Revenue [Member] | Zenas BioPharma Limited [Member]
Related Party Transaction [Line Items]
Revenues			$ 1,900	$ 1,000	$ 2,700	$ 1,500