Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001558370-20-002028-index-headers.html | 2020-03-04 16:52:14 | |
| 0001558370-20-002028-index.html | 2020-03-04 16:52:14 | |
| 0001558370-20-002028.txt | 2020-03-04 16:52:14 | |
 0001558370-20-002028-xbrl.zip | 235765 | 2020-03-04 16:52:14 |
| FilingSummary.xml | 50417 | 2020-03-04 16:52:14 |
| Financial_Report.xlsx | 117481 | 2020-03-04 16:52:14 |
| R1.htm | 39563 | 2020-03-04 16:52:14 |
| R10.htm | 319676 | 2020-03-04 16:52:14 |
| R11.htm | 24199 | 2020-03-04 16:52:14 |
| R12.htm | 44632 | 2020-03-04 16:52:14 |
| R13.htm | 5302 | 2020-03-04 16:52:14 |
| R14.htm | 22048 | 2020-03-04 16:52:14 |
| R15.htm | 61949 | 2020-03-04 16:52:14 |
| R16.htm | 62091 | 2020-03-04 16:52:14 |
| R17.htm | 136018 | 2020-03-04 16:52:14 |
| R18.htm | 8344 | 2020-03-04 16:52:14 |
| R19.htm | 25046 | 2020-03-04 16:52:14 |
| R2.htm | 109680 | 2020-03-04 16:52:14 |
| R20.htm | 174839 | 2020-03-04 16:52:14 |
| R21.htm | 7370 | 2020-03-04 16:52:14 |
| R22.htm | 38551 | 2020-03-04 16:52:14 |
| R23.htm | 52255 | 2020-03-04 16:52:14 |
| R24.htm | 88918 | 2020-03-04 16:52:14 |
| R25.htm | 78596 | 2020-03-04 16:52:14 |
| R26.htm | 85612 | 2020-03-04 16:52:14 |
| R27.htm | 321840 | 2020-03-04 16:52:14 |
| R28.htm | 24994 | 2020-03-04 16:52:14 |
| R29.htm | 42545 | 2020-03-04 16:52:14 |
| R3.htm | 15811 | 2020-03-04 16:52:14 |
| R30.htm | 20302 | 2020-03-04 16:52:14 |
| R31.htm | 57090 | 2020-03-04 16:52:14 |
| R32.htm | 53473 | 2020-03-04 16:52:14 |
| R33.htm | 139277 | 2020-03-04 16:52:14 |
| R34.htm | 171790 | 2020-03-04 16:52:14 |
| R35.htm | 31357 | 2020-03-04 16:52:14 |
| R36.htm | 50872 | 2020-03-04 16:52:14 |
| R37.htm | 87434 | 2020-03-04 16:52:14 |
| R38.htm | 78041 | 2020-03-04 16:52:14 |
| R39.htm | 30839 | 2020-03-04 16:52:14 |
| R4.htm | 89255 | 2020-03-04 16:52:14 |
| R40.htm | 51419 | 2020-03-04 16:52:14 |
| R41.htm | 11025 | 2020-03-04 16:52:14 |
| R42.htm | 20442 | 2020-03-04 16:52:14 |
| R43.htm | 12935 | 2020-03-04 16:52:14 |
| R44.htm | 25876 | 2020-03-04 16:52:14 |
| R45.htm | 55737 | 2020-03-04 16:52:14 |
| R46.htm | 50198 | 2020-03-04 16:52:14 |
| R47.htm | 22096 | 2020-03-04 16:52:14 |
| R48.htm | 10990 | 2020-03-04 16:52:14 |
| R49.htm | 13643 | 2020-03-04 16:52:14 |
| R5.htm | 53366 | 2020-03-04 16:52:14 |
| R50.htm | 33475 | 2020-03-04 16:52:14 |
| R51.htm | 34892 | 2020-03-04 16:52:14 |
| R52.htm | 30110 | 2020-03-04 16:52:14 |
| R53.htm | 29139 | 2020-03-04 16:52:14 |
| R54.htm | 9823 | 2020-03-04 16:52:14 |
| R55.htm | 15816 | 2020-03-04 16:52:14 |
| R56.htm | 16359 | 2020-03-04 16:52:14 |
| R57.htm | 55099 | 2020-03-04 16:52:14 |
| R58.htm | 39268 | 2020-03-04 16:52:14 |
| R59.htm | 31186 | 2020-03-04 16:52:14 |
| R6.htm | 9825 | 2020-03-04 16:52:14 |
| R60.htm | 86693 | 2020-03-04 16:52:14 |
| R61.htm | 24220 | 2020-03-04 16:52:14 |
| R62.htm | 20096 | 2020-03-04 16:52:14 |
| R63.htm | 30948 | 2020-03-04 16:52:14 |
| R64.htm | 13681 | 2020-03-04 16:52:14 |
| R65.htm | 13000 | 2020-03-04 16:52:14 |
| R66.htm | 11344 | 2020-03-04 16:52:14 |
| R67.htm | 36712 | 2020-03-04 16:52:14 |
| R68.htm | 24522 | 2020-03-04 16:52:14 |
| R69.htm | 50803 | 2020-03-04 16:52:14 |
| R7.htm | 128284 | 2020-03-04 16:52:14 |
| R70.htm | 32000 | 2020-03-04 16:52:14 |
| R71.htm | 33039 | 2020-03-04 16:52:14 |
| R72.htm | 22213 | 2020-03-04 16:52:14 |
| R73.htm | 20873 | 2020-03-04 16:52:14 |
| R74.htm | 38014 | 2020-03-04 16:52:14 |
| R75.htm | 25128 | 2020-03-04 16:52:14 |
| R76.htm | 50651 | 2020-03-04 16:52:14 |
| R77.htm | 17675 | 2020-03-04 16:52:14 |
| R78.htm | 17362 | 2020-03-04 16:52:14 |
| R79.htm | 9764 | 2020-03-04 16:52:14 |
| R8.htm | 9091 | 2020-03-04 16:52:14 |
| R80.htm | 12591 | 2020-03-04 16:52:14 |
| R81.htm | 4783 | 2020-03-04 16:52:14 |
| R82.htm | 33134 | 2020-03-04 16:52:14 |
| R83.htm | 23814 | 2020-03-04 16:52:14 |
| R84.htm | 15274 | 2020-03-04 16:52:14 |
| R85.htm | 38118 | 2020-03-04 16:52:14 |
| R9.htm | 38589 | 2020-03-04 16:52:14 |
| report.css | 2767 | 2020-03-04 16:52:14 |
| Show.js | 1085 | 2020-03-04 16:52:14 |
| usx-20191231.xml | 2745163 | 2020-03-04 16:52:14 |
| usx-20191231.xsd | 76474 | 2020-03-04 16:52:14 |
| usx-20191231ex211a1b1dd.htm | 12213 | 2020-03-04 16:52:14 |
| usx-20191231ex2317287b1.htm | 2970 | 2020-03-04 16:52:14 |
| usx-20191231ex311faf406.htm | 16828 | 2020-03-04 16:52:14 |
| usx-20191231ex3125a7e57.htm | 16312 | 2020-03-04 16:52:14 |
| usx-20191231ex321e5fb04.htm | 7247 | 2020-03-04 16:52:14 |
| usx-20191231ex32271b2b2.htm | 7298 | 2020-03-04 16:52:14 |
| usx-20191231ex41dc15d0d.htm | 58535 | 2020-03-04 16:52:14 |
| usx-20191231x10k.htm | 3371812 | 2020-03-04 16:52:14 |
| usx-20191231_cal.xml | 117693 | 2020-03-04 16:52:14 |
| usx-20191231_def.xml | 358961 | 2020-03-04 16:52:14 |
| usx-20191231_lab.xml | 793763 | 2020-03-04 16:52:14 |
| usx-20191231_pre.xml | 643358 | 2020-03-04 16:52:14 |
 usx20191231x10k001.jpg | 73072 | 2020-03-04 16:52:14 |
 usx20191231x10k002.jpg | 746 | 2020-03-04 16:52:14 |
 usx20191231x10k003.jpg | 725 | 2020-03-04 16:52:14 |
 usx20191231x10k004.jpg | 720 | 2020-03-04 16:52:14 |