| Cover Page - USD ($) $ in Millions | 12 Months Ended | ||
| Dec. 31, 2020 | Mar. 11, 2021 | Jun. 30, 2020 | |
| Entity Information [Line Items] | |||
| Document Type | 10-K/A | ||
| Document Annual Report | true | ||
| Document Period End Date | Dec. 31, 2020 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document Transition Report | false | ||
| Entity File Number | 1-13610 | ||
| Entity Registrant Name | CIM COMMERCIAL TRUST CORPORATION | ||
| Entity Incorporation, State or Country Code | MD | ||
| Entity Tax Identification Number | 75-6446078 | ||
| Entity Address, Address Line One | 17950 Preston Road, | ||
| Entity Address, Address Line Two | Suite 600, | ||
| Entity Address, City or Town | Dallas, | ||
| Entity Address, State or Province | TX | ||
| Entity Address, Postal Zip Code | 75252 | ||
| City Area Code | (972) | ||
| Local Phone Number | 349-3200 | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Accelerated Filer | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 126.5 | ||
| Entity Common Stock, Shares Outstanding | 14,827,410 | ||
| Entity Central Index Key | 0000908311 | ||
| Amendment Flag | false | ||
| Document Fiscal Year Focus | 2020 | ||
| Document Fiscal Period Focus | FY | ||
| Common Stock, $0.001 Par Value | Nasdaq Global Market | |||
| Entity Information [Line Items] | |||
| Title of 12(b) Security | Common Stock, $0.001 Par Value | ||
| Trading Symbol | CMCT | ||
| Security Exchange Name | NASDAQ | ||
| Common Stock, $0.001 Par Value | Tel Aviv Stock Exchange | |||
| Entity Information [Line Items] | |||
| Title of 12(b) Security | Common Stock, $0.001 Par Value | ||
| Trading Symbol | CMCT-L | ||
| Series L Preferred Stock, $0.001 Par Value | Nasdaq Global Market | |||
| Entity Information [Line Items] | |||
| Title of 12(b) Security | Series L Preferred Stock, $0.001 Par Value | ||
| Trading Symbol | CMCTP | ||
| Security Exchange Name | NASDAQ | ||
| Series L Preferred Stock, $0.001 Par Value | Tel Aviv Stock Exchange | |||
| Entity Information [Line Items] | |||
| Title of 12(b) Security | Series L Preferred Stock, $0.001 Par Value | ||
| Trading Symbol | CMCTP |
