Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-23-012204-index-headers.html | 2023-04-07 16:30:50 | |
| 0000950170-23-012204-index.html | 2023-04-07 16:30:50 | |
| 0000950170-23-012204.txt | 2023-04-07 16:30:50 | |
 0000950170-23-012204-xbrl.zip | 1252202 | 2023-04-07 16:30:50 |
| atra-20230407.htm | 1971232 | 2023-04-07 16:30:50 |
| atra-20230407.xsd | 5606 | 2023-04-07 16:30:50 |
| atra-20230407_def.xml | 5776 | 2023-04-07 16:30:50 |
| atra-20230407_htm.xml | 346917 | 2023-04-07 16:30:50 |
| atra-20230407_lab.xml | 12699 | 2023-04-07 16:30:50 |
| atra-20230407_pre.xml | 7964 | 2023-04-07 16:30:50 |
| FilingSummary.xml | 2807 | 2023-04-07 16:30:50 |
| Financial_Report.xlsx | 11320 | 2023-04-07 16:30:50 |
 img120903765_0.jpg | 5500 | 2023-04-07 16:30:50 |
 img120903765_1.jpg | 32199 | 2023-04-07 16:30:50 |
 img120903765_10.jpg | 431812 | 2023-04-07 16:30:50 |
 img120903765_2.jpg | 25689 | 2023-04-07 16:30:50 |
 img120903765_3.jpg | 132642 | 2023-04-07 16:30:50 |
 img120903765_4.jpg | 27578 | 2023-04-07 16:30:50 |
 img120903765_5.jpg | 18463 | 2023-04-07 16:30:50 |
 img120903765_6.jpg | 47143 | 2023-04-07 16:30:50 |
 img120903765_7.jpg | 44729 | 2023-04-07 16:30:50 |
 img120903765_8.jpg | 34803 | 2023-04-07 16:30:50 |
 img120903765_9.jpg | 494296 | 2023-04-07 16:30:50 |
| MetaLinks.json | 62622 | 2023-04-07 16:30:50 |
| R1.htm | 8956 | 2023-04-07 16:30:50 |
| R2.htm | 344687 | 2023-04-07 16:30:50 |
| report.css | 2767 | 2023-04-07 16:30:50 |
| Show.js | 1085 | 2023-04-07 16:30:50 |