Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 01, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Registrant Name	SiTime Corporation
Entity Central Index Key	0001451809
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock Shares Outstanding		19,060,787
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
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 Quarterly Report	true
Document Transition Report	false