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| 0001564590-16-023141-index.html | 2016-08-08 08:11:14 | |
| 0001564590-16-023141.txt | 2016-08-08 08:11:14 | |
 0001564590-16-023141-xbrl.zip | 90822 | 2016-08-08 08:11:14 |
| atra-10q_20160630.htm | 1886561 | 2016-08-08 08:11:14 |
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| atra-ex311_6.htm | 14881 | 2016-08-08 08:11:14 |
| atra-ex312_7.htm | 14905 | 2016-08-08 08:11:14 |
| atra-ex321_9.htm | 7768 | 2016-08-08 08:11:14 |
| FilingSummary.xml | 21175 | 2016-08-08 08:11:14 |
| Financial_Report.xlsx | 40207 | 2016-08-08 08:11:14 |
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| report.css | 2767 | 2016-08-08 08:11:14 |
| Show.js | 1410 | 2016-08-08 08:11:14 |