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Income Taxes - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Income Taxes Disclosure [Line Items] | |||
| Provision for income taxes | $ 0 | ||
| US federal and state net operating loss carryforwards expiration date | 2032 | ||
| Unrecognized tax positions | 185,961 | 182,251 | 174,289 |
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UK [Member]
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| Income Taxes Disclosure [Line Items] | |||
| Net operating loss carryforwards | 41,700,000 | 35,500,000 | |
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Germany [Member]
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| Income Taxes Disclosure [Line Items] | |||
| Net operating loss carryforwards | 1,142,197 | 918,275 | |
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US Federal [Member]
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| Income Taxes Disclosure [Line Items] | |||
| Net operating loss carryforwards | 692,153 | 169,410 | |
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US State [Member]
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| Income Taxes Disclosure [Line Items] | |||
| Net operating loss carryforwards | $ 690,942 | $ 168,352 |