Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Nov. 02, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-38685
Entity Registrant Name	Grid Dynamics Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	83-0632724
Entity Address, Address Line One	5000 Executive Parkway
Entity Address, Address Line Two	Suite 520
Entity Address, City or Town	San Ramon
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94583
City Area Code	650
Local Phone Number	523-5000
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	GDYN
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		65,251,896
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	0001743725
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3