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Prepaid Expenses and Other Current Assets | 12 Months Ended
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Dec. 31, 2017
Prepaid Expenses And Other Current Assets [Abstract] |
Prepaid Expenses and Other Current Assets | 6. Prepaid Expenses and Other Current Assets The following is a summary of prepaid expenses and other current assets at December 31, 2016 and 2017 (in thousands):
|  |  | December 31, |
|  |  | 2016 |  |  | 2017 |
Research and development tax credit receivable |  |  |  | $ | 1,730 |  |  |  |  | $ | 1,054 |  |
Prepayments |  |  |  |  | 867 |  |  |  |  |  | 363 |  |
Delaware tax receivable |  |  |  |  | — |  |  |  |  |  | 25 |  |
VAT receivable |  |  |  |  | 327 |  |  |  |  |  | 409 |  |
Deposits |  |  |  |  | 132 |  |  |  |  |  | 132 |  |
Other current assets |  |  |  |  | 41 |  |  |  |  |  | 81 |  |
Prepaid expenses and other current assets |  |  |  | $ | 3,097 |  |  |  |  | $ | 2,064 |  |

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