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Prepaid Expenses and Other Current Assets | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Prepaid Expenses and Other Current Assets |
(3) | Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consist of the following:
(in thousands) |  | June 30, 2018 |  |  | December 31, 2017 |
Insurance premiums |  | $ | 168 |  |  | $ | 421 |
Security deposit |  |  | 50 |  |  |  | 50 |
VAT/GST receivable |  |  | 37 |  |  |  | 29 |
Software |  |  | 26 |  |  |  | 15 |
Financing costs |  |  | 25 |  |  |  | 70 |
Other1 |  |  | 76 |  |  |  | 115 |
Total prepaid expenses and other current assets |  | $ | 382 |  |  | $ | 700 |
| 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, 2018 and December 31, 2017.
(5) | Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets include the following:
(in thousands) |  | December 31, 2017 |  |  | December 31, 2016 |
Insurance premiums |  | $ | 421 |  |  | $ | 501 |
Financing costs |  |  | 70 |  |  |  | — |
Security deposit |  |  | 50 |  |  |  | 50 |
Other1 |  |  | 159 |  |  |  | 147 |
Total prepaid expenses and other current assets |  | $ | 700 |  |  | $ | 698 |
1 | Other consists of various prepaid expenses and other current assets, with no individual item accounting for more than 5% at December 31, 2017 and 2016.

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