Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-25-106550-index-headers.html | 2025-08-11 16:10:29 | |
| 0000950170-25-106550-index.html | 2025-08-11 16:10:29 | |
| 0000950170-25-106550.txt | 2025-08-11 16:10:29 | |
 0000950170-25-106550-xbrl.zip | 338758 | 2025-08-11 16:10:29 |
| atra-20250630.htm | 3116536 | 2025-08-11 16:10:29 |
| atra-20250630.xsd | 1384037 | 2025-08-11 16:10:29 |
| atra-20250630_htm.xml | 2148634 | 2025-08-11 16:10:29 |
| atra-ex10_1.htm | 59810 | 2025-08-11 16:10:29 |
| atra-ex31_1.htm | 15304 | 2025-08-11 16:10:29 |
| atra-ex31_2.htm | 15342 | 2025-08-11 16:10:29 |
| atra-ex32_1.htm | 11254 | 2025-08-11 16:10:29 |
| FilingSummary.xml | 43381 | 2025-08-11 16:10:29 |
| MetaLinks.json | 991010 | 2025-08-11 16:10:29 |
| R1.htm | 51569 | 2025-08-11 16:10:29 |
| R10.htm | 18973 | 2025-08-11 16:10:29 |
| R11.htm | 82736 | 2025-08-11 16:10:29 |
| R12.htm | 74996 | 2025-08-11 16:10:29 |
| R13.htm | 177626 | 2025-08-11 16:10:29 |
| R14.htm | 56960 | 2025-08-11 16:10:29 |
| R15.htm | 28472 | 2025-08-11 16:10:29 |
| R16.htm | 159340 | 2025-08-11 16:10:29 |
| R17.htm | 64290 | 2025-08-11 16:10:29 |
| R18.htm | 28370 | 2025-08-11 16:10:29 |
| R19.htm | 163645 | 2025-08-11 16:10:29 |
| R2.htm | 104363 | 2025-08-11 16:10:29 |
| R20.htm | 88801 | 2025-08-11 16:10:29 |
| R21.htm | 95847 | 2025-08-11 16:10:29 |
| R22.htm | 66967 | 2025-08-11 16:10:29 |
| R23.htm | 73458 | 2025-08-11 16:10:29 |
| R24.htm | 173035 | 2025-08-11 16:10:29 |
| R25.htm | 19036 | 2025-08-11 16:10:29 |
| R26.htm | 20661 | 2025-08-11 16:10:29 |
| R27.htm | 42544 | 2025-08-11 16:10:29 |
| R28.htm | 148515 | 2025-08-11 16:10:29 |
| R29.htm | 50457 | 2025-08-11 16:10:29 |
| R3.htm | 12040 | 2025-08-11 16:10:29 |
| R30.htm | 113383 | 2025-08-11 16:10:29 |
| R31.htm | 90046 | 2025-08-11 16:10:29 |
| R32.htm | 18915 | 2025-08-11 16:10:29 |
| R33.htm | 37611 | 2025-08-11 16:10:29 |
| R34.htm | 6855 | 2025-08-11 16:10:29 |
| R35.htm | 10382 | 2025-08-11 16:10:29 |
| R36.htm | 13558 | 2025-08-11 16:10:29 |
| R37.htm | 38605 | 2025-08-11 16:10:29 |
| R38.htm | 21247 | 2025-08-11 16:10:29 |
| R39.htm | 4259 | 2025-08-11 16:10:29 |
| R4.htm | 81724 | 2025-08-11 16:10:29 |
| R40.htm | 11217 | 2025-08-11 16:10:29 |
| R41.htm | 19673 | 2025-08-11 16:10:29 |
| R42.htm | 5018 | 2025-08-11 16:10:29 |
| R43.htm | 16866 | 2025-08-11 16:10:29 |
| R44.htm | 54892 | 2025-08-11 16:10:29 |
| R45.htm | 15261 | 2025-08-11 16:10:29 |
| R46.htm | 15904 | 2025-08-11 16:10:29 |
| R47.htm | 42724 | 2025-08-11 16:10:29 |
| R48.htm | 28229 | 2025-08-11 16:10:29 |
| R49.htm | 17200 | 2025-08-11 16:10:29 |
| R5.htm | 61783 | 2025-08-11 16:10:29 |
| R50.htm | 24729 | 2025-08-11 16:10:29 |
| R51.htm | 38159 | 2025-08-11 16:10:29 |
| R52.htm | 15042 | 2025-08-11 16:10:29 |
| R53.htm | 12355 | 2025-08-11 16:10:29 |
| R54.htm | 27882 | 2025-08-11 16:10:29 |
| R55.htm | 165391 | 2025-08-11 16:10:29 |
| R56.htm | 30933 | 2025-08-11 16:10:29 |
| R57.htm | 35559 | 2025-08-11 16:10:29 |
| R58.htm | 17214 | 2025-08-11 16:10:29 |
| R59.htm | 10446 | 2025-08-11 16:10:29 |
| R6.htm | 6465 | 2025-08-11 16:10:29 |
| R60.htm | 5099 | 2025-08-11 16:10:29 |
| R61.htm | 8894 | 2025-08-11 16:10:29 |
| R62.htm | 23473 | 2025-08-11 16:10:29 |
| R63.htm | 12799 | 2025-08-11 16:10:29 |
| R7.htm | 99935 | 2025-08-11 16:10:29 |
| R8.htm | 15071 | 2025-08-11 16:10:29 |
| R9.htm | 8464 | 2025-08-11 16:10:29 |
| report.css | 2767 | 2025-08-11 16:10:29 |
| Show.js | 1085 | 2025-08-11 16:10:29 |