Summary of Significant Accounting Policies - Summary of Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss attributable to aTyr Pharma, Inc.	$ (33,768)	$ (16,224)	$ (23,603)
Denominator:
Shares used in computing net loss per share, basic and diluted	19,080,878	9,160,269	3,355,600
Net loss per share - basic and diluted	$ (1.77)	$ (1.77)	$ (7.03)