Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-22-046032-index-headers.html | 2022-02-18 08:06:02 | |
| 0001193125-22-046032-index.html | 2022-02-18 08:06:02 | |
| 0001193125-22-046032.txt | 2022-02-18 08:06:02 | |
 0001193125-22-046032-xbrl.zip | 8850 | 2022-02-18 08:06:02 |
| atra-20220218.xsd | 2861 | 2022-02-18 08:06:02 |
| atra-20220218_lab.xml | 17996 | 2022-02-18 08:06:02 |
| atra-20220218_pre.xml | 11265 | 2022-02-18 08:06:02 |
| d325651d8k.htm | 25522 | 2022-02-18 08:06:02 |
| d325651d8k_htm.xml | 3370 | 2022-02-18 08:06:02 |
| FilingSummary.xml | 1700 | 2022-02-18 08:06:02 |
| Financial_Report.xlsx | 5720 | 2022-02-18 08:06:02 |
| MetaLinks.json | 18349 | 2022-02-18 08:06:02 |
| R1.htm | 40152 | 2022-02-18 08:06:02 |
| report.css | 2766 | 2022-02-18 08:06:02 |
| Show.js | 1084 | 2022-02-18 08:06:02 |