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Prepaid Expenses and Other Current Assets | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |
Prepaid Expenses And Other Current Assets |
(4) | PREPAID EXPENSES AND OTHER CURRENT ASSETS
Prepaid expenses and other current assets consist of the following:
(in thousands) |  | June 30, 2019 |  |  | December 31, 2018 |
Insurance premiums |  | $ | 175 |  |  | $ | 140 |
Sublease income |  |  | 127 |  |  |  | — |
Financing costs |  |  | 80 |  |  |  | — |
Security deposit |  |  | 50 |  |  |  | 51 |
Income tax and VAT receivable |  |  | 31 |  |  |  | 579 |
Other1 |  |  | 201 |  |  |  | 128 |
Total prepaid expenses and other current assets |  | $ | 664 |  |  | $ | 898 |
| 1 | Other consists of various prepaid expenses and other current assets, with no individual item accounting for more than 5% of prepaid expenses and other current assets at June 30, 2019 and December 31, 2018.
(6) | PREPAID EXPENSES AND OTHER CURRENT ASSETS
Prepaid expenses and other current assets include the following:
(in thousands) |  | December 31, 2018 |  |  | December 31, 2017 |
Insurance premiums |  | $ | 140 |  |  | $ | 421 |
Financing costs |  |  | — |  |  |  | 70 |
Security deposit |  |  | 51 |  |  |  | 50 |
Income tax and VAT receivable |  |  | 579 |  |  |  | 29 |
Other1 |  |  | 128 |  |  |  | 130 |
Total prepaid expenses and other current assets |  | $ | 898 |  |  | $ | 700 |
| 1 | Other consists of various prepaid expenses and other current assets, with no individual item accounting for more than 5% at December 31, 2018 and 2017.

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