Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001564590-21-023329-index-headers.html | 2021-05-04 16:07:32 | |
| 0001564590-21-023329-index.html | 2021-05-04 16:07:32 | |
| 0001564590-21-023329.txt | 2021-05-04 16:07:32 | |
 0001564590-21-023329-xbrl.zip | 20622 | 2021-05-04 16:07:32 |
| atra-20210504.xsd | 5776 | 2021-05-04 16:07:32 |
| atra-20210504_lab.xml | 19469 | 2021-05-04 16:07:32 |
| atra-20210504_pre.xml | 11630 | 2021-05-04 16:07:32 |
| atra-8k_20210504.htm | 38845 | 2021-05-04 16:07:32 |
| atra-8k_20210504_htm.xml | 3576 | 2021-05-04 16:07:32 |
| atra-ex991_69.htm | 258940 | 2021-05-04 16:07:32 |
| FilingSummary.xml | 1744 | 2021-05-04 16:07:32 |
| Financial_Report.xlsx | 5717 | 2021-05-04 16:07:32 |
| MetaLinks.json | 19786 | 2021-05-04 16:07:32 |
| R1.htm | 40188 | 2021-05-04 16:07:32 |
| report.css | 2767 | 2021-05-04 16:07:32 |
| Show.js | 1084 | 2021-05-04 16:07:32 |