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Restricted Cash (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018
Restricted Cash [Abstract] |  |
Schedule of Cash, Cash Equivalents, and Restricted Cash | Cash, cash equivalents, and restricted cash balances were as follows:
(in thousands) |  | June 30, 2019 |  |  | December 31, 2018 |
Cash and cash equivalents |  | $ | 352 |  |  | $ | 2,516 |
Letters of credit |  |  | 1,012 |  |  |  | 1,012 |
Security for credit cards |  |  | 50 |  |  |  | 50 |
Total cash, cash equivalents and restricted cash shown in the statements of cash flows |  | $ | 1,414 |  |  | $ | 3,578 |
(in thousands) |  | December 31, 2018 |  |  | December 31, 2017 |
Cash and cash equivalents |  | $ | 2,516 |  |  | $ | 3,999 |
Convertible Notes |  |  | — |  |  |  | 238 |
Letters of credit |  |  | 1,012 |  |  |  | 1,012 |
Security for credit cards |  |  | 50 |  |  |  | 75 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows |  | $ | 3,578 |  |  | $ | 5,324 |

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