Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001564590-20-021930-index-headers.html | 2020-05-06 16:11:01 | |
| 0001564590-20-021930-index.html | 2020-05-06 16:11:01 | |
| 0001564590-20-021930.txt | 2020-05-06 16:11:01 | |
 0001564590-20-021930-xbrl.zip | 22065 | 2020-05-06 16:11:01 |
| atra-20200506.xsd | 5776 | 2020-05-06 16:11:01 |
| atra-20200506_lab.xml | 19495 | 2020-05-06 16:11:01 |
| atra-20200506_pre.xml | 11632 | 2020-05-06 16:11:01 |
| atra-8k_20200506.htm | 39545 | 2020-05-06 16:11:01 |
| atra-8k_20200506_htm.xml | 3574 | 2020-05-06 16:11:01 |
| atra-ex991_6.htm | 225570 | 2020-05-06 16:11:01 |
| FilingSummary.xml | 1743 | 2020-05-06 16:11:01 |
| Financial_Report.xlsx | 5848 | 2020-05-06 16:11:01 |
| MetaLinks.json | 19812 | 2020-05-06 16:11:01 |
| R1.htm | 40205 | 2020-05-06 16:11:01 |
| report.css | 2766 | 2020-05-06 16:11:01 |
| Show.js | 1085 | 2020-05-06 16:11:01 |