Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-22-015519-index-headers.html | 2022-08-08 16:07:59 | |
| 0000950170-22-015519-index.html | 2022-08-08 16:07:59 | |
| 0000950170-22-015519.txt | 2022-08-08 16:07:59 | |
 0000950170-22-015519-xbrl.zip | 25852 | 2022-08-08 16:07:59 |
| atra-20220802.htm | 68939 | 2022-08-08 16:07:59 |
| atra-20220802.xsd | 2469 | 2022-08-08 16:07:59 |
| atra-20220802_htm.xml | 4728 | 2022-08-08 16:07:59 |
| atra-20220802_lab.xml | 13352 | 2022-08-08 16:07:59 |
| atra-20220802_pre.xml | 9843 | 2022-08-08 16:07:59 |
| atra-ex99_1.htm | 427465 | 2022-08-08 16:07:59 |
| FilingSummary.xml | 1738 | 2022-08-08 16:07:59 |
| Financial_Report.xlsx | 5750 | 2022-08-08 16:07:59 |
| MetaLinks.json | 17478 | 2022-08-08 16:07:59 |
| R1.htm | 40128 | 2022-08-08 16:07:59 |
| report.css | 2767 | 2022-08-08 16:07:59 |
| Show.js | 1084 | 2022-08-08 16:07:59 |