Cover - shares	3 Months Ended
	Mar. 31, 2021	May 17, 2021
Cover [Abstract]
Entity Registrant Name	NANOPHASE TECHNOLOGIES Corp
Entity Central Index Key	0000883107
Document Type	10-Q/A
Amendment Flag	true
Amendment Description	Nanophase Technologies Corporation ("the Company") is filing this Amendment No. 1 on Form 10-Q/A (the "Amended Filing") to amend and restate its quarterly report on Form 10-Q for the quarter ended March 31, 2021, originally filed with the U.S. Securities and Exchange Commission (the "SEC") on May 17, 2021 (the "Original Filing"). In filing this amendment, the Company restates its previously issued unaudited consolidated condensed financial statements and related disclosures for the period ended March 31, 2021 to include forgiveness of the Company's PPP Loan.
Document Period End Date	Mar. 31, 2021
Entity File Number	000-22333
Entity Incorporation, State Code	DE
Current Fiscal Year End Date	--12-31
Entity Reporting Status Current	Yes
Entity Interactive Data Current	Yes
Entity Small Business	true
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		48,336,877
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021