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| 0001104659-12-005282-index.html | 2012-01-31 10:01:32 | |
| 0001104659-12-005282.txt | 2012-01-31 10:01:32 | |
 0001104659-12-005282-xbrl.zip | 48755 | 2012-01-31 10:01:32 |
| a11-31049_110q.htm | 645225 | 2012-01-31 10:01:32 |
| a11-31049_1ex31d1.htm | 13006 | 2012-01-31 10:01:32 |
| a11-31049_1ex31d2.htm | 13458 | 2012-01-31 10:01:32 |
| a11-31049_1ex32.htm | 7827 | 2012-01-31 10:01:32 |
| FilingSummary.xml | 5910 | 2012-01-31 10:01:32 |
| Financial_Report.xls | 228123 | 2012-01-31 10:01:32 |
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| imgn-20111231.xsd | 8680 | 2012-01-31 10:01:32 |
| imgn-20111231_cal.xml | 37471 | 2012-01-31 10:01:32 |
| imgn-20111231_def.xml | 55497 | 2012-01-31 10:01:32 |
| imgn-20111231_lab.xml | 173025 | 2012-01-31 10:01:32 |
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| R1.htm | 29289 | 2012-01-31 10:01:32 |
| R10.htm | 24481 | 2012-01-31 10:01:32 |
| R2.htm | 115486 | 2012-01-31 10:01:32 |
| R3.htm | 29715 | 2012-01-31 10:01:32 |
| R4.htm | 56361 | 2012-01-31 10:01:32 |
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| R9.htm | 6090 | 2012-01-31 10:01:32 |
| report.css | 2721 | 2012-01-31 10:01:32 |
| Show.js | 6423 | 2012-01-31 10:01:32 |