Parent Directory| Name | Size | Last Modified |
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| 0001558370-23-012499.txt | 2023-07-31 06:40:32 | |
 0001558370-23-012499-xbrl.zip | 20466 | 2023-07-31 06:40:32 |
| FilingSummary.xml | 2210 | 2023-07-31 06:40:32 |
| Financial_Report.xlsx | 6632 | 2023-07-31 06:40:32 |
| imgn-20230731.xsd | 4365 | 2023-07-31 06:40:32 |
| imgn-20230731x8k.htm | 36530 | 2023-07-31 06:40:32 |
| imgn-20230731x8k_htm.xml | 4636 | 2023-07-31 06:40:32 |
| imgn-20230731xex99d1.htm | 209462 | 2023-07-31 06:40:32 |
 imgn-20230731xex99d1001.jpg | 7018 | 2023-07-31 06:40:32 |
| imgn-20230731_def.xml | 3238 | 2023-07-31 06:40:32 |
| imgn-20230731_lab.xml | 634 | 2023-07-31 06:40:32 |
| imgn-20230731_pre.xml | 10104 | 2023-07-31 06:40:32 |
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| R1.htm | 38090 | 2023-07-31 06:40:32 |
| R2.htm | 21136 | 2023-07-31 06:40:32 |
| report.css | 2767 | 2023-07-31 06:40:32 |
| Show.js | 1085 | 2023-07-31 06:40:32 |