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Restricted Cash (Tables) | 3 Months Ended
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Mar. 31, 2019
Restricted Cash [Abstract] |
Schedule of Cash, Cash Equivalents, and Restricted Cash | Cash, cash equivalents, and restricted cash balances were as follows:
|  | March 31, |  |  | December 31, |
(in thousands) |  |  | 2019 |  |  |  | 2018 |
Cash and cash equivalents |  | $ | 264 |  |  | $ | 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 statement of cash flows |  | $ | 1,326 |  |  | $ | 3,578 |

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