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Common Stock - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended |  |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Jan. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011 | Dec. 11, 2013 Series D-2 Purchase Agreement [Member] | Mar. 31, 2014 Common Stock Warrants [Member] | Mar. 31, 2013 Common Stock Warrants [Member] | Dec. 11, 2013 June 2013 Note and Warrant Agreement [Member]
Common stock par value | $ 0.001 |  |  | $ 0.001 |  |  |  |  |
Common stock, shares authorized | 70,000,000 |  |  | 70,000,000 |  |  |  |  |
Common stock, shares issued | 334,484 |  |  | 334,068 |  |  |  |  |
Common stock, shares outstanding | 334,484 |  |  | 334,068 |  |  |  |  |
Number of warrants issued to purchase common stock |  |  | 19,048 |  | 26,000 | 87,532 |  |  | 88,987
Exercise price of warrants |  |  | 0.20 |  | 0.20 | 0.20 |  |  | 0.20
Expiration date of warrants | Jun. 30, 2017 |  |  |  |  |  |  |  |
Conversion price calculation - percentage multiple component | 20.00% |  |  |  |  |  |  |  |
Conversion price calculation - price component | $ 87.98 |  |  |  |  |  |  |  |
Warrants exercisable date |  |  |  |  |  | Dec. 11, 2018 |  |  | Jun. 28, 2018
Increase in the shares of common stock underlying the warrants issued |  |  |  |  |  | 54,120 |  |  |
Revised number of common shares underlying the warrants issued |  |  |  |  |  | 80,120 |  |  |
Number of warrants exercised | 0 | 0 |  |  |  |  |  |  |
Fair value of common stock warrant derivative liabilities | $ 9,998 |  |  | $ 12,237 |  |  |  |  |
Other (expense) income related to fair value adjustment of long term derivative liability | $ (3,145) |  |  |  |  |  | $ 3,108 | $ 0 |

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