Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001663577-19-000021-index-headers.html | 2019-01-11 14:58:46 | |
| 0001663577-19-000021-index.html | 2019-01-11 14:58:46 | |
| 0001663577-19-000021.txt | 2019-01-11 14:58:46 | |
 0001663577-19-000021-xbrl.zip | 34822 | 2019-01-11 14:58:46 |
| alta-20171231.xml | 115646 | 2019-01-11 14:58:46 |
| alta-20171231.xsd | 19263 | 2019-01-11 14:58:46 |
| alta-20171231_cal.xml | 20998 | 2019-01-11 14:58:46 |
| alta-20171231_def.xml | 31928 | 2019-01-11 14:58:46 |
| alta-20171231_lab.xml | 98544 | 2019-01-11 14:58:46 |
| alta-20171231_pre.xml | 83780 | 2019-01-11 14:58:46 |
| ex31_1.htm | 9005 | 2019-01-11 14:58:46 |
| ex31_2.htm | 9004 | 2019-01-11 14:58:46 |
| ex32_1.htm | 3942 | 2019-01-11 14:58:46 |
| FilingSummary.xml | 14296 | 2019-01-11 14:58:46 |
| Financial_Report.xlsx | 27281 | 2019-01-11 14:58:46 |
 image_001.gif | 5157 | 2019-01-11 14:58:46 |
| mainbody.htm | 163164 | 2019-01-11 14:58:46 |
| R1.htm | 27734 | 2019-01-11 14:58:46 |
| R10.htm | 13334 | 2019-01-11 14:58:46 |
| R11.htm | 6487 | 2019-01-11 14:58:46 |
| R12.htm | 4926 | 2019-01-11 14:58:46 |
| R13.htm | 6409 | 2019-01-11 14:58:46 |
| R14.htm | 5244 | 2019-01-11 14:58:46 |
| R15.htm | 44618 | 2019-01-11 14:58:46 |
| R16.htm | 6468 | 2019-01-11 14:58:46 |
| R17.htm | 10801 | 2019-01-11 14:58:46 |
| R18.htm | 5682 | 2019-01-11 14:58:46 |
| R19.htm | 4869 | 2019-01-11 14:58:46 |
| R2.htm | 38330 | 2019-01-11 14:58:46 |
| R20.htm | 10145 | 2019-01-11 14:58:46 |
| R21.htm | 21303 | 2019-01-11 14:58:46 |
| R22.htm | 16582 | 2019-01-11 14:58:46 |
| R23.htm | 6219 | 2019-01-11 14:58:46 |
| R24.htm | 19566 | 2019-01-11 14:58:46 |
| R3.htm | 14628 | 2019-01-11 14:58:46 |
| R4.htm | 32984 | 2019-01-11 14:58:46 |
| R5.htm | 18358 | 2019-01-11 14:58:46 |
| R6.htm | 30550 | 2019-01-11 14:58:46 |
| R7.htm | 5891 | 2019-01-11 14:58:46 |
| R8.htm | 19290 | 2019-01-11 14:58:46 |
| R9.htm | 7507 | 2019-01-11 14:58:46 |
| report.css | 2767 | 2019-01-11 14:58:46 |
| Show.js | 1085 | 2019-01-11 14:58:46 |