| Document and Entity Information | Feb. 28, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | ICAD INC |
| Amendment Flag | false |
| Entity Central Index Key | 0000749660 |
| Document Type | 8-K |
| Document Period End Date | Feb. 28, 2022 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-09341 |
| Entity Tax Identification Number | 02-0377419 |
| Entity Address, Address Line One | 98 Spit Brook Road |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Nashua |
| Entity Address, State or Province | NH |
| Entity Address, Postal Zip Code | 03062 |
| City Area Code | (603) |
| Local Phone Number | 882-5200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | ICAD |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
