Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-19-274911-index-headers.html | 2019-10-25 17:16:21 | |
| 0001193125-19-274911-index.html | 2019-10-25 17:16:21 | |
| 0001193125-19-274911.txt | 2019-10-25 17:16:21 | |
 0001193125-19-274911-xbrl.zip | 8228 | 2019-10-25 17:16:21 |
| atra-20191021.xsd | 3072 | 2019-10-25 17:16:21 |
| atra-20191021_lab.xml | 18141 | 2019-10-25 17:16:21 |
| atra-20191021_pre.xml | 11410 | 2019-10-25 17:16:21 |
| d806364d8k.htm | 24484 | 2019-10-25 17:16:21 |
| d806364d8k_htm.xml | 3425 | 2019-10-25 17:16:21 |
| FilingSummary.xml | 1692 | 2019-10-25 17:16:21 |
| Financial_Report.xlsx | 5832 | 2019-10-25 17:16:21 |
| MetaLinks.json | 18806 | 2019-10-25 17:16:21 |
| R1.htm | 40184 | 2019-10-25 17:16:21 |
| report.css | 2767 | 2019-10-25 17:16:21 |
| Show.js | 1084 | 2019-10-25 17:16:21 |