Net (Loss)/Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net (loss)/income	$ (18,223)	$ 2,574
Net loss attributable to noncontrolling interest	43	22
Net (loss)/income attributable to Vaccitech plc shareholders	$ (18,180)	$ 2,596
Denominator:
Weighted-average ordinary shares outstanding, basic	38,013,399	37,191,022
Effect of dilutive stock options		1,155,646
Weighted-average ordinary shares outstanding, diluted	38,013,399	38,346,668
Net (loss)/income per share attributable to ordinary shareholders, basic	$ (0.48)	$ 0.070
Net (loss)/income per share attributable to ordinary shareholders, diluted	$ (0.48)	$ 0.068