Cover - USD ($)	12 Months Ended
Cover - USD ($)	Dec. 31, 2022	Mar. 31, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	0-23970
Entity Registrant Name	FALCONSTOR SOFTWARE, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0216135
Entity Address, Address Line One	501 Congress Avenue, Suite 150
Entity Address, City or Town	Austin
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78701
City Area Code	631
Local Phone Number	777-5188
Title of 12(g) Security	Common stock, $0.001 Par Value
Trading Symbol	FALC
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	false
Entity Public Float			$ 3,742,024
Entity Common Stock, Shares Outstanding		7,122,199
Entity Central Index Key	0000922521
Amendment Flag	true
Amendment Description	On March 23, 2023, FalconStor Software, Inc., a Delaware corporation, filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “Original Filing”). Certain Part III information was omitted from the Original Filing in reliance on General Instruction G(3) to Form 10-K. General Instruction G(3) to Form 10-K provides that a registrant may incorporate by reference certain information from a definitive proxy statement which involves the election of directors, if such definitive proxy statement is filed with the Securities and Exchange Commission (the “Commission”) no later than 120 days after the end of the registrant’s fiscal year. Alternatively, the registrant may provide this information in an amendment to the Form 10-K, if such amendment is filed with the Commission no later than 120 days after the end of the registrant’s fiscal year. Accordingly, this Amendment No. 1 on Form 10-K/A (this “Amendment”) supplements the Original Filing by amending and restating Part III, Items 10 through 14 of the Original Filing. Except as stated herein, this Amendment does not reflect events occurring after the filing of the Original Filing, and no attempt has been made in this Amendment to modify or update other disclosures as presented in the Original Filing. Throughout this Amendment, unless indicated otherwise, we refer to FalconStor Software, Inc. and its subsidiaries as “we,” “us,” “our,” “FalconStor,” “FalconStor Software” and the “Company”.
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Documents Incorporated by Reference [Text Block]	The following documents (or parts thereof) are incorporated by reference into the following parts of this Form 10-K: None.
Auditor Name	Marcum LLP
Auditor Location	Costa Mesa, CA,
Auditor Firm ID	688

FALCONSTOR SOFTWARE INC 10-K/A