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Summary Information Regarding Options and Warrants (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Options              
Number of Shares, Outstanding at beginning of period 824,620 442,923 385,516 480,833 388,048 259,565 190,426
Options, Granted 125,000 411,938 76,157 38,138 193,583 160,100 73,475
Options, Exercised        (36,284) (15,193)    
Options, Forfeited and canceled (46,331) (30,241) (18,750) (97,171) (85,605) (31,617) (4,336)
Number of Shares, Outstanding at end of period 903,289 824,620 442,923 385,516 480,833 388,048 259,565
Weighted Average Exercise Price, Options              
Weighted average exercise price options, Beginning balance $ 5.54 $ 7.71 $ 8.60 $ 14.80 $ 25.88 $ 39.16 $ 45.92
Weighted average exercise price options, Granted $ 2.34 $ 3.68 $ 6.29 $ 8.34 $ 3.83 $ 4.50 $ 21.12
Weighted average exercise price options, Exercised        $ 3.56 $ 4.21    
Weighted average exercise price options, Forfeited and canceled $ 4.73 $ 11.80 $ 20.00 $ 36.62 $ 42.22 $ 24.41 $ 30.96
Weighted average exercise price options, Ending balance $ 5.14 $ 5.54 $ 7.71 $ 8.60 $ 14.80 $ 25.88 $ 39.16
Warrants
              
Warrants              
Number of Shares, Outstanding at beginning of period   2,607,550 2,864,873 3,169,169 2,599,799 917,590 917,590
Warrants, Granted   1,436,121 414,649 1,966 801,143 1,682,209 0
Warrants, Exercised   0 0 (17,102) (179,691)    
Warrants, Forfeited and canceled   (464,584) (671,972) (289,160) (52,082) 0 0
Number of Shares, Outstanding at end of period   3,579,087 2,607,550 2,864,873 3,169,169 2,599,799 917,590
Weighted Average Exercise Price, Warrants              
Weighted average exercise price warrants, Beginning balance   $ 6.66 $ 11.00 $ 27.72 $ 32.60 $ 78.04 $ 78.04
Weighted average exercise price warrants, Granted   $ 2.56 $ 10.44 $ 8.00 $ 6.68 $ 7.84  
Weighted average exercise price warrants, Exercised       $ 8.40 $ 6.64    
Weighted average exercise price warrants, Forfeited and canceled   $ 6.12 $ 23.72 $ 117.60 $ 20.00    
Weighted average exercise price warrants, Ending balance   $ 5.64 $ 6.66 $ 11.00 $ 27.72 $ 32.60 $ 78.04