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Summary of Significant Accounting Policies (Detail Textuals) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) Segment | Dec. 31, 2016 GBP (£) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Accounting Policies [Line Items] |  |  |  |
Number of operating segments | Segment | 1 |  |  |
Cash and cash equivalents | $ 16,520,000 |  | $ 20,440,000 | $ 24,189,000
Number of geographic areas for development operations | Segment | 2 | 2 |  |
Cash balances insured by FDIC | $ 250,000 |  |  |
Cash exceeding balance insured by FDIC | 15,000,000 |  |  |
Cash balance insured by FSCS | £ |  | £ 75,000 |  |
Cash exceeding balance insured by FSCS | $ 1,100,000 |  |  |
Impact of change in accounting policy recorded in accumulated deficit |  |  | $ 89,000 |
Property, plant and equipment | Minimum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful life | 3 years |  |  |
Property, plant and equipment | Maximum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful life | 5 years |  |  |
Leasehold improvements | Minimum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful life | 5 years |  |  |
Leasehold improvements | Maximum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful life | 15 years |  |  |

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