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Prepaid Expenses and Other Current Assets (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |
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.
| 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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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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