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Prepaid Expenses and Other Current Assets (Tables) | 6 Months Ended
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Jun. 30, 2019
Prepaid Expense And Other Assets Current [Abstract] |
Summary of Prepaids and Other Current Assets | Prepaids and other current assets consisted of the following as of December 31, 2018 and June 30, 2019:
|  | December 31, 2018 |  |  | June 30, 2019 |
|  | (in thousands) |
Prepaid inventory |  | $ | 2,284 |  |  | $ | 1,577 |
Restricted cash |  |  | 550 |  |  |  | 307 |
Prepaid Insurance |  |  | 434 |  |  |  | 2,987 |
Deferred offering costs |  |  | 1,218 |  |  |  | — |
Other |  |  | 932 |  |  |  | 880 |
Prepaid and other current assets |  | $ | 5,418 |  |  | $ | 5,751 |

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