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Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Prepaid Expense and Other Assets, Current [Abstract] |  |
Research and development tax credit receivable | $ 1,054 | $ 1,730
Prepayments | 363 | 867
Delaware tax receivable | 25 | 0
VAT receivable | 409 | 327
Deposits | 132 | 132
Other current assets | 81 | 41
Prepaid expenses and other current assets | $ 2,064 | $ 3,097

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other tax receivables expected to be realized or consumed within one year or operating cycle, if longer. + References No definition available. + Details
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