Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2025	Feb. 20, 2026	Jun. 30, 2025
Document Information [Line Items]
Entity Central Index Key	0001120914
Entity Registrant Name	PDF SOLUTIONS INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Document Transition Report	false
Entity File Number	000-31311
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-1701361
Entity Address, Address Line One	2858 De La Cruz Blvd.
Entity Address, Postal Zip Code	95050
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
City Area Code	408
Local Phone Number	280-7900
Title of 12(b) Security	Common Stock, $0.00015 par value
Trading Symbol	PDFS
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 641,000,000
Entity Common Stock, Shares Outstanding		39,890,709
Auditor Name	BPM LLP
Auditor Location	San Jose, California
Auditor Firm ID	207