Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-23-027257-index-headers.html | 2023-06-09 16:06:19 | |
| 0000950170-23-027257-index.html | 2023-06-09 16:06:19 | |
| 0000950170-23-027257.txt | 2023-06-09 16:06:19 | |
 0000950170-23-027257-xbrl.zip | 8617 | 2023-06-09 16:06:19 |
| atra-20230609.htm | 49419 | 2023-06-09 16:06:19 |
| atra-20230609.xsd | 2469 | 2023-06-09 16:06:19 |
| atra-20230609_htm.xml | 4728 | 2023-06-09 16:06:19 |
| atra-20230609_lab.xml | 13360 | 2023-06-09 16:06:19 |
| atra-20230609_pre.xml | 9843 | 2023-06-09 16:06:19 |
| FilingSummary.xml | 1705 | 2023-06-09 16:06:19 |
| Financial_Report.xlsx | 5756 | 2023-06-09 16:06:19 |
| MetaLinks.json | 18078 | 2023-06-09 16:06:19 |
| R1.htm | 39664 | 2023-06-09 16:06:19 |
| report.css | 2766 | 2023-06-09 16:06:19 |
| Show.js | 1084 | 2023-06-09 16:06:19 |