| Document and Entity Information | Nov. 09, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | SITIME Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0001451809 |
| Document Type | 8-K |
| Document Period End Date | Nov. 9, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39135 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.0001 par value per share |
| Trading Symbol | SITM |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
