Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 28, 2022	Jun. 30, 2021
Document Information Line Items
Entity Registrant Name	RUBICON TECHNOLOGY, INC.
Trading Symbol	RBCN
Document Type	10-K/A
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		2,446,652
Entity Public Float			$ 19,082,840
Amendment Flag	true
Amendment Description	Rubicon Technology, Inc. (“Rubicon” or the “Company”) is filing this Amendment No. 1 (“Amended Report”) to our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, filed with the Securities and Exchange Commission (SEC) on March 28, 2022 (“Original Report”), in order to add certain information required by the following items in Part III of Form 10-K:
Entity Central Index Key	0001410172
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-33834
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-4419301
Entity Address, Address Line One	900 East Green Street
Entity Address, City or Town	Bensenville
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60106
City Area Code	(847)
Local Phone Number	295-7000
Title of 12(b) Security	Common Stock, par value $0.001 per share
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Auditor Name	Marcum LLP
Auditor Location	Chicago
Auditor Firm ID	688