Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001721868-20-000454-index-headers.html | 2020-10-19 16:29:54 | |
| 0001721868-20-000454-index.html | 2020-10-19 16:29:54 | |
| 0001721868-20-000454.txt | 2020-10-19 16:29:54 | |
 0001721868-20-000454-xbrl.zip | 114846 | 2020-10-19 16:29:54 |
| f2sgrst10q101620.htm | 1007318 | 2020-10-19 16:29:54 |
| f2sgrst10q101620ex31_1.htm | 12937 | 2020-10-19 16:29:54 |
| f2sgrst10q101620ex32_1.htm | 4722 | 2020-10-19 16:29:54 |
| FilingSummary.xml | 24906 | 2020-10-19 16:29:54 |
| Financial_Report.xlsx | 83685 | 2020-10-19 16:29:54 |
| grst-20200630.xml | 1081744 | 2020-10-19 16:29:54 |
| grst-20200630.xsd | 51670 | 2020-10-19 16:29:54 |
| grst-20200630_cal.xml | 62053 | 2020-10-19 16:29:54 |
| grst-20200630_def.xml | 57491 | 2020-10-19 16:29:54 |
| grst-20200630_lab.xml | 244269 | 2020-10-19 16:29:54 |
| grst-20200630_pre.xml | 181438 | 2020-10-19 16:29:54 |
| R1.htm | 27406 | 2020-10-19 16:29:54 |
| R10.htm | 7139 | 2020-10-19 16:29:54 |
| R11.htm | 13800 | 2020-10-19 16:29:54 |
| R12.htm | 7977 | 2020-10-19 16:29:54 |
| R13.htm | 13828 | 2020-10-19 16:29:54 |
| R14.htm | 79836 | 2020-10-19 16:29:54 |
| R15.htm | 28656 | 2020-10-19 16:29:54 |
| R16.htm | 4676 | 2020-10-19 16:29:54 |
| R17.htm | 21213 | 2020-10-19 16:29:54 |
| R18.htm | 7151 | 2020-10-19 16:29:54 |
| R19.htm | 67998 | 2020-10-19 16:29:54 |
| R2.htm | 85726 | 2020-10-19 16:29:54 |
| R20.htm | 12829 | 2020-10-19 16:29:54 |
| R21.htm | 93895 | 2020-10-19 16:29:54 |
| R22.htm | 26599 | 2020-10-19 16:29:54 |
| R23.htm | 7357 | 2020-10-19 16:29:54 |
| R24.htm | 11851 | 2020-10-19 16:29:54 |
| R25.htm | 98220 | 2020-10-19 16:29:54 |
| R26.htm | 13032 | 2020-10-19 16:29:54 |
| R27.htm | 10812 | 2020-10-19 16:29:54 |
| R28.htm | 48362 | 2020-10-19 16:29:54 |
| R29.htm | 27320 | 2020-10-19 16:29:54 |
| R3.htm | 24747 | 2020-10-19 16:29:54 |
| R30.htm | 19431 | 2020-10-19 16:29:54 |
| R31.htm | 52845 | 2020-10-19 16:29:54 |
| R32.htm | 10014 | 2020-10-19 16:29:54 |
| R33.htm | 91057 | 2020-10-19 16:29:54 |
| R34.htm | 25669 | 2020-10-19 16:29:54 |
| R35.htm | 6575 | 2020-10-19 16:29:54 |
| R36.htm | 10259 | 2020-10-19 16:29:54 |
| R37.htm | 14144 | 2020-10-19 16:29:54 |
| R38.htm | 30235 | 2020-10-19 16:29:54 |
| R39.htm | 8945 | 2020-10-19 16:29:54 |
| R4.htm | 74584 | 2020-10-19 16:29:54 |
| R40.htm | 7668 | 2020-10-19 16:29:54 |
| R41.htm | 18698 | 2020-10-19 16:29:54 |
| R42.htm | 12970 | 2020-10-19 16:29:54 |
| R43.htm | 30550 | 2020-10-19 16:29:54 |
| R44.htm | 15725 | 2020-10-19 16:29:54 |
| R45.htm | 92020 | 2020-10-19 16:29:54 |
| R46.htm | 8059 | 2020-10-19 16:29:54 |
| R5.htm | 59189 | 2020-10-19 16:29:54 |
| R6.htm | 84501 | 2020-10-19 16:29:54 |
| R7.htm | 14208 | 2020-10-19 16:29:54 |
| R8.htm | 63723 | 2020-10-19 16:29:54 |
| R9.htm | 7708 | 2020-10-19 16:29:54 |
| report.css | 2767 | 2020-10-19 16:29:54 |
| Show.js | 1085 | 2020-10-19 16:29:54 |