Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001564590-20-052486-index-headers.html | 2020-11-09 16:05:26 | |
| 0001564590-20-052486-index.html | 2020-11-09 16:05:26 | |
| 0001564590-20-052486.txt | 2020-11-09 16:05:26 | |
 0001564590-20-052486-xbrl.zip | 24176 | 2020-11-09 16:05:26 |
| atra-20201109.xsd | 5776 | 2020-11-09 16:05:26 |
| atra-20201109_lab.xml | 19469 | 2020-11-09 16:05:26 |
| atra-20201109_pre.xml | 11630 | 2020-11-09 16:05:26 |
| atra-8k_20201109.htm | 39685 | 2020-11-09 16:05:26 |
| atra-8k_20201109_htm.xml | 3576 | 2020-11-09 16:05:26 |
| atra-ex991_6.htm | 310781 | 2020-11-09 16:05:26 |
| FilingSummary.xml | 1743 | 2020-11-09 16:05:26 |
| Financial_Report.xlsx | 5497 | 2020-11-09 16:05:26 |
| MetaLinks.json | 19786 | 2020-11-09 16:05:26 |
| R1.htm | 40190 | 2020-11-09 16:05:26 |
| report.css | 2767 | 2020-11-09 16:05:26 |
| Show.js | 1084 | 2020-11-09 16:05:26 |