Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001654954-21-005766-index-headers.html | 2021-05-17 08:54:04 | |
| 0001654954-21-005766-index.html | 2021-05-17 08:54:04 | |
| 0001654954-21-005766.txt | 2021-05-17 08:54:04 | |
 0001654954-21-005766-xbrl.zip | 57592 | 2021-05-17 08:54:04 |
| FilingSummary.xml | 23642 | 2021-05-17 08:54:04 |
| Financial_Report.xlsx | 53162 | 2021-05-17 08:54:04 |
| R1.htm | 32692 | 2021-05-17 08:54:04 |
| R10.htm | 8511 | 2021-05-17 08:54:04 |
| R11.htm | 9801 | 2021-05-17 08:54:04 |
| R12.htm | 29856 | 2021-05-17 08:54:04 |
| R13.htm | 11682 | 2021-05-17 08:54:04 |
| R14.htm | 7899 | 2021-05-17 08:54:04 |
| R15.htm | 9003 | 2021-05-17 08:54:04 |
| R16.htm | 13589 | 2021-05-17 08:54:04 |
| R17.htm | 9631 | 2021-05-17 08:54:04 |
| R18.htm | 5190 | 2021-05-17 08:54:04 |
| R19.htm | 6846 | 2021-05-17 08:54:04 |
| R2.htm | 86961 | 2021-05-17 08:54:04 |
| R20.htm | 20760 | 2021-05-17 08:54:04 |
| R21.htm | 8519 | 2021-05-17 08:54:04 |
| R22.htm | 9779 | 2021-05-17 08:54:04 |
| R23.htm | 22042 | 2021-05-17 08:54:04 |
| R24.htm | 11502 | 2021-05-17 08:54:04 |
| R25.htm | 7499 | 2021-05-17 08:54:04 |
| R26.htm | 10391 | 2021-05-17 08:54:04 |
| R27.htm | 15985 | 2021-05-17 08:54:04 |
| R28.htm | 10484 | 2021-05-17 08:54:04 |
| R29.htm | 6442 | 2021-05-17 08:54:04 |
| R3.htm | 14665 | 2021-05-17 08:54:04 |
| R30.htm | 19410 | 2021-05-17 08:54:04 |
| R31.htm | 19592 | 2021-05-17 08:54:04 |
| R32.htm | 6962 | 2021-05-17 08:54:04 |
| R33.htm | 10612 | 2021-05-17 08:54:04 |
| R34.htm | 6488 | 2021-05-17 08:54:04 |
| R35.htm | 9750 | 2021-05-17 08:54:04 |
| R36.htm | 13761 | 2021-05-17 08:54:04 |
| R37.htm | 6420 | 2021-05-17 08:54:04 |
| R38.htm | 29384 | 2021-05-17 08:54:04 |
| R39.htm | 4753 | 2021-05-17 08:54:04 |
| R4.htm | 56952 | 2021-05-17 08:54:04 |
| R5.htm | 27505 | 2021-05-17 08:54:04 |
| R6.htm | 75719 | 2021-05-17 08:54:04 |
| R7.htm | 15434 | 2021-05-17 08:54:04 |
| R8.htm | 7338 | 2021-05-17 08:54:04 |
| R9.htm | 31072 | 2021-05-17 08:54:04 |
| report.css | 2767 | 2021-05-17 08:54:04 |
| Show.js | 1085 | 2021-05-17 08:54:04 |
| zmtp-20210331.xml | 242775 | 2021-05-17 08:54:04 |
| zmtp-20210331.xsd | 23579 | 2021-05-17 08:54:04 |
| zmtp-20210331_cal.xml | 52760 | 2021-05-17 08:54:04 |
| zmtp-20210331_def.xml | 36523 | 2021-05-17 08:54:04 |
| zmtp-20210331_lab.xml | 155219 | 2021-05-17 08:54:04 |
| zmtp-20210331_pre.xml | 126403 | 2021-05-17 08:54:04 |
| zmtp_10q.htm | 718032 | 2021-05-17 08:54:04 |
| zmtp_ex311.htm | 14607 | 2021-05-17 08:54:04 |
| zmtp_ex312.htm | 14366 | 2021-05-17 08:54:04 |
| zmtp_ex321.htm | 9373 | 2021-05-17 08:54:04 |
| zmtp_ex322.htm | 9523 | 2021-05-17 08:54:04 |