Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001558370-18-006326-index-headers.html | 2018-08-03 11:30:05 | |
| 0001558370-18-006326-index.html | 2018-08-03 11:30:05 | |
| 0001558370-18-006326.txt | 2018-08-03 11:30:05 | |
 0001558370-18-006326-xbrl.zip | 195129 | 2018-08-03 11:30:05 |
| FilingSummary.xml | 28264 | 2018-08-03 11:30:05 |
| Financial_Report.xlsx | 84603 | 2018-08-03 11:30:05 |
| imgn-20180630.xml | 2581414 | 2018-08-03 11:30:05 |
| imgn-20180630.xsd | 50984 | 2018-08-03 11:30:05 |
| imgn-20180630ex1012f6e53.htm | 61259 | 2018-08-03 11:30:05 |
| imgn-20180630ex3118c03d9.htm | 11542 | 2018-08-03 11:30:05 |
| imgn-20180630ex312e863af.htm | 11584 | 2018-08-03 11:30:05 |
| imgn-20180630x10q.htm | 1473167 | 2018-08-03 11:30:05 |
| imgn-20180630xex32.htm | 10301 | 2018-08-03 11:30:05 |
| imgn-20180630_cal.xml | 40229 | 2018-08-03 11:30:05 |
| imgn-20180630_def.xml | 282074 | 2018-08-03 11:30:05 |
| imgn-20180630_lab.xml | 464307 | 2018-08-03 11:30:05 |
| imgn-20180630_pre.xml | 440939 | 2018-08-03 11:30:05 |
| R1.htm | 22209 | 2018-08-03 11:30:05 |
| R10.htm | 7747 | 2018-08-03 11:30:05 |
| R11.htm | 22037 | 2018-08-03 11:30:05 |
| R12.htm | 7126 | 2018-08-03 11:30:05 |
| R13.htm | 9431 | 2018-08-03 11:30:05 |
| R14.htm | 7972 | 2018-08-03 11:30:05 |
| R15.htm | 26982 | 2018-08-03 11:30:05 |
| R16.htm | 729578 | 2018-08-03 11:30:05 |
| R17.htm | 642286 | 2018-08-03 11:30:05 |
| R18.htm | 17294 | 2018-08-03 11:30:05 |
| R19.htm | 19425 | 2018-08-03 11:30:05 |
| R2.htm | 77192 | 2018-08-03 11:30:05 |
| R20.htm | 14840 | 2018-08-03 11:30:05 |
| R21.htm | 144143 | 2018-08-03 11:30:05 |
| R22.htm | 97711 | 2018-08-03 11:30:05 |
| R23.htm | 53859 | 2018-08-03 11:30:05 |
| R24.htm | 52315 | 2018-08-03 11:30:05 |
| R25.htm | 15152 | 2018-08-03 11:30:05 |
| R26.htm | 4688 | 2018-08-03 11:30:05 |
| R27.htm | 39692 | 2018-08-03 11:30:05 |
| R28.htm | 16209 | 2018-08-03 11:30:05 |
| R29.htm | 24116 | 2018-08-03 11:30:05 |
| R3.htm | 25005 | 2018-08-03 11:30:05 |
| R30.htm | 23922 | 2018-08-03 11:30:05 |
| R31.htm | 126287 | 2018-08-03 11:30:05 |
| R32.htm | 20116 | 2018-08-03 11:30:05 |
| R33.htm | 19153 | 2018-08-03 11:30:05 |
| R34.htm | 17418 | 2018-08-03 11:30:05 |
| R35.htm | 17579 | 2018-08-03 11:30:05 |
| R36.htm | 24948 | 2018-08-03 11:30:05 |
| R37.htm | 20045 | 2018-08-03 11:30:05 |
| R38.htm | 20261 | 2018-08-03 11:30:05 |
| R39.htm | 24907 | 2018-08-03 11:30:05 |
| R4.htm | 43691 | 2018-08-03 11:30:05 |
| R40.htm | 30862 | 2018-08-03 11:30:05 |
| R41.htm | 29407 | 2018-08-03 11:30:05 |
| R42.htm | 9077 | 2018-08-03 11:30:05 |
| R43.htm | 29609 | 2018-08-03 11:30:05 |
| R44.htm | 29669 | 2018-08-03 11:30:05 |
| R45.htm | 71929 | 2018-08-03 11:30:05 |
| R5.htm | 60645 | 2018-08-03 11:30:05 |
| R6.htm | 4252 | 2018-08-03 11:30:05 |
| R7.htm | 7930 | 2018-08-03 11:30:05 |
| R8.htm | 702236 | 2018-08-03 11:30:05 |
| R9.htm | 25207 | 2018-08-03 11:30:05 |
| report.css | 2767 | 2018-08-03 11:30:05 |
| Show.js | 1410 | 2018-08-03 11:30:05 |