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| 0001104659-20-137507-index.html | 2020-12-18 17:19:13 | |
| 0001104659-20-137507.txt | 2020-12-18 17:19:13 | |
 0001104659-20-137507-xbrl.zip | 59329 | 2020-12-18 17:19:13 |
| FilingSummary.xml | 1720 | 2020-12-18 17:19:13 |
| Financial_Report.xlsx | 5420 | 2020-12-18 17:19:13 |
| imgn-20201218.xsd | 3190 | 2020-12-18 17:19:13 |
| imgn-20201218_lab.xml | 34592 | 2020-12-18 17:19:13 |
| imgn-20201218_pre.xml | 22713 | 2020-12-18 17:19:13 |
| MetaLinks.json | 38702 | 2020-12-18 17:19:13 |
| R1.htm | 38583 | 2020-12-18 17:19:13 |
| report.css | 2767 | 2020-12-18 17:19:13 |
| Show.js | 1085 | 2020-12-18 17:19:13 |
| tm2038486d4_8k.htm | 29328 | 2020-12-18 17:19:13 |
| tm2038486d4_8k_htm.xml | 3468 | 2020-12-18 17:19:13 |
| tm2038486d4_ex10-1.htm | 242703 | 2020-12-18 17:19:13 |
| tm2038486d4_ex5-1.htm | 12457 | 2020-12-18 17:19:13 |
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| tm2038486d4_ex99-1.htm | 4829 | 2020-12-18 17:19:13 |