Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 01, 2021
Document and Entity Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Registrant Name	HUDSON TECHNOLOGIES INC /NY
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Central Index Key	0000925528
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Trading Symbol	HDSN
Entity Common Stock, Shares Outstanding		43,385,092
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	true
Title of 12(b) Security	Common stock, $0.01 par value
Security Exchange Name	NASDAQ