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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