Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 01, 2021	Jun. 30, 2020
Document and Entity Information
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
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		43,347,887
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	true
Entity Public Float			$ 37,335,882
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Title of 12(b) Security	Common stock, $0.01 par value
Security Exchange Name	NASDAQ