Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001564590-21-009845-index-headers.html | 2021-03-01 16:06:04 | |
| 0001564590-21-009845-index.html | 2021-03-01 16:06:04 | |
| 0001564590-21-009845.txt | 2021-03-01 16:06:04 | |
 0001564590-21-009845-xbrl.zip | 22031 | 2021-03-01 16:06:04 |
| atra-20210301.xsd | 5776 | 2021-03-01 16:06:04 |
| atra-20210301_lab.xml | 19469 | 2021-03-01 16:06:04 |
| atra-20210301_pre.xml | 11630 | 2021-03-01 16:06:04 |
| atra-8k_20210301.htm | 38898 | 2021-03-01 16:06:04 |
| atra-8k_20210301_htm.xml | 3576 | 2021-03-01 16:06:04 |
| atra-ex991_77.htm | 259488 | 2021-03-01 16:06:04 |
| FilingSummary.xml | 1744 | 2021-03-01 16:06:04 |
| Financial_Report.xlsx | 5497 | 2021-03-01 16:06:04 |
| MetaLinks.json | 19786 | 2021-03-01 16:06:04 |
| R1.htm | 40190 | 2021-03-01 16:06:04 |
| report.css | 2767 | 2021-03-01 16:06:04 |
| Show.js | 1084 | 2021-03-01 16:06:04 |