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| 0000910638-19-000007-index.html | 2019-05-07 16:02:26 | |
| 0000910638-19-000007.txt | 2019-05-07 16:02:26 | |
 0000910638-19-000007-xbrl.zip | 155039 | 2019-05-07 16:02:26 |
| ddd-20190331.xml | 1126947 | 2019-05-07 16:02:26 |
| ddd-20190331.xsd | 38316 | 2019-05-07 16:02:26 |
| ddd-20190331_cal.xml | 90053 | 2019-05-07 16:02:26 |
| ddd-20190331_def.xml | 128427 | 2019-05-07 16:02:26 |
| ddd-20190331_lab.xml | 485483 | 2019-05-07 16:02:26 |
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| ddd2019-03x31form10xqdocum.htm | 1043999 | 2019-05-07 16:02:26 |
| ddd20190331ex311.htm | 14245 | 2019-05-07 16:02:26 |
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| ddd20190331ex321.htm | 6404 | 2019-05-07 16:02:26 |
| ddd20190331ex322.htm | 6403 | 2019-05-07 16:02:26 |
| FilingSummary.xml | 35411 | 2019-05-07 16:02:26 |
| Financial_Report.xlsx | 72185 | 2019-05-07 16:02:26 |
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| report.css | 2767 | 2019-05-07 16:02:26 |
| Show.js | 1085 | 2019-05-07 16:02:26 |