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| 0001654954-19-003878.txt | 2019-04-01 17:05:44 | |
 0001654954-19-003878-xbrl.zip | 79455 | 2019-04-01 17:05:44 |
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| R9.htm | 6859 | 2019-04-01 17:05:44 |
| report.css | 2767 | 2019-04-01 17:05:44 |
| Show.js | 1085 | 2019-04-01 17:05:44 |
| zmtp-20181231.xml | 467665 | 2019-04-01 17:05:44 |
| zmtp-20181231.xsd | 29424 | 2019-04-01 17:05:44 |
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| zmtp_ex311.htm | 12902 | 2019-04-01 17:05:44 |
| zmtp_ex321.htm | 7507 | 2019-04-01 17:05:44 |