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Equity Method Investment - Additional Information (Detail) £ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
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Nov. 30, 2015 USD ($) shares | Nov. 30, 2015 GBP (£) shares | Oct. 31, 2014 USD ($) shares | Jul. 31, 2014 USD ($) shares | Jul. 31, 2014 GBP (£) shares | Feb. 28, 2014 USD ($) shares | Feb. 28, 2014 GBP (£) shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Amount raised by equity investee on shares issued |  |  |  |  |  |  |  | $ 317 | $ 1,666 | $ 1,610
Gain (Loss) on dilution of equity method investment |  |  |  |  |  |  |  | $ (7) | $ 954 |
Warrants exercised amount |  |  | $ 500 |  |  |  |  |  |  |
Warrants exercised shares | shares |  |  | 6,155,000 |  |  |  |  |  |  |
Equity investment ownership position |  |  |  |  |  |  |  | 15.11% |  |
Carrying value of equity investment |  |  |  |  |  |  |  | $ 2,536 |  |
Quoted market value of equity investment |  |  |  |  |  |  |  | $ 1,850 |  |
TyraTech Inc. |  |  |  |  |  |  |  |  |  |
Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued by equity investee | shares | 105,333,333 | 105,333,333 |  | 50,000,000 | 50,000,000 | 37,391,763 | 37,391,763 |  |  |
Amount raised by equity investee on shares issued | $ 4,800 | £ 3,200 |  | $ 5,900 | £ 3,500 | $ 3,100 | £ 1,870 |  |  |

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