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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 17, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name SiTime Corporation    
Entity Central Index Key 0001451809    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 1,592,780,318
Entity Common Stock Shares Outstanding   20,824,740  
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Small Business true    
Entity Emerging Growth Company false    
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Trading Symbol SITM    
Security Exchange Name NASDAQ    
Entity File Number 001-39135    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 02-0713868    
Entity Address, Address Line One 5451 Patrick Henry Drive    
Entity Address, City or Town Santa Clara    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95054    
City Area Code 408    
Local Phone Number 328-4400    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 243    
Auditor Name BDO USA, LLP    
Auditor Location San Jose, California    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Part III incorporates by reference certain information from the registrant’s definitive proxy statement for the 2022 Annual Meeting of Stockholders to be filed no later than 120 days after the conclusion of the registrant’s fiscal year ended December 31, 2021.