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RXi Spin-off (Additional Information) (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Apr. 30, 2012 | Sep. 24, 2011
Related Party Transaction [Line Items] |  |  |
Proceeds from sale of shares after spin-off | $ 3,911,000 |  |
RXi [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Cash contribution in capital |  |  | 1,500,000
Proceeds from technology revenue | 45,000,000 |  |
Proceeds from technology revenue under condition one | 15,000,000 |  |
Proceeds from technology revenue under condition two | 30,000,000 |  |
Minimum estimated sales | 500,000,000 |  |
Estimated sales | 1,000,000,000 |  |
Number of shares distributed to surrenders under spin-off |  | 66,959,894 |
Number of shares retained by company under spin-off |  | 33,476,595 |
Lock up period of shares under spin-off | 1 year |  |
Expiration date of shares under spin-off | Apr. 27, 2013 |  |
Number of shares sold by company after spin-off | 1,115,887 |  |
Retained price per shares under spin-off | $ 2.40 |  |
Retained value of shares under spin-off | $ 2,678,000 |  |

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