Net Loss Per Share - Summary of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net loss attributable to Kineta, Inc.		$ (5,380)	$ (5,585)	$ (11,445)	$ (16,439)
Denominator:
Weighted-average shares outstanding, basic	[1]	11,738	4,891	10,505	4,808
Weighted-average shares outstanding, diluted	[1]	11,738	4,891	10,505	4,808
Net loss per share, basic		$ (0.46)	$ (1.14)	$ (1.09)	$ (3.42)
Net loss per share, diluted		$ (0.46)	$ (1.14)	$ (1.09)	$ (3.42)

[1] Included in the denominator were 577,000 and 530,000 weighted-average shares of common stock warrants for the three and nine months ended September 30, 2023, respectively, with an exercise price of $0.14. Included in the denominator were 155,000 and 153,000 weighted-average shares of common stock warrants for the three and nine months ended September 30, 2022, respectively, with an exercise price of $0.14.