XML 33 R36.htm IDEA: XBRL DOCUMENT
v3.19.2

Foreign Operations (Tables) | 12 Months Ended
--- | ---
Jun. 30, 2019
Foreign Currency [Abstract] |
Assets and net assets in foreign countries |
|  | China |  |  | Latvia |
|  | June 30, 2019 |  |  | June 30, 2018 |  |  | June 30, 2019 |  |  | June 30, 2018 |
Assets |  | $ | 16.9 million |  |  | $ | 14.7 million |  |  | $ | 8.2 million |  |  | $ | 6.4 million |
Net assets |  | $ | 14.5 million |  |  | $ | 12.6 million |  |  | $ | 7.8 million |  |  | $ | 5.9 million |

X
- References No definition available. + Details
Name: | LPTH_ScheduleOfAssetForeignTableTextBlock
Namespace Prefix: | LPTH_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ForeignCurrencyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration