General form of registration statement for all companies including face-amount certificate companies

Stockholders' Equity (Detail) - Stock Options Issued Activity

v2.3.0.11
Stockholders' Equity (Detail) - Stock Options Issued Activity (USD $)
 6 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 22, 2009
Dec. 31, 2008
Dec. 31, 2008
Minimum [Member]
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2010
Minimum [Member]
Dec. 31, 2009
Minimum [Member]
Dec. 31, 2008
Maximum [Member]
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2010
Maximum [Member]
Dec. 31, 2009
Maximum [Member]
Balance Options Outstanding (in Shares) 6,111,127 3,679,977 3,762,477 669,777   599,875                
Balance Range of Exercise Prices Minimum             $ 0.88 $ 0.88 $ 0.88 $ 0.88        
Balance Range of Exercise Prices Maximum                     $ 24.00 $ 9.64 $ 24.00 $ 24.00
Balance Weighted-Average Exercise Price Per Share $ 1.57 $ 2.05 $ 2.11 $ 4.28   $ 3.62                
Balance Intrinsic Value (in Dollars)     $ 262,500 [1] $ 3,694,400 [1]   $ 3,742,700 [1]                
Options exercisable (in Shares)   1,501,659 433,746 483,364   432,083                
Options exercisable Range of Exercise Prices Minimum             $ 0.88 $ 0.88 $ 0.88 $ 0.88        
Options exercisable Range of Exercise Prices Maximum       $ 3.20             $ 24.00 $ 9.64 $ 24.00 $ 24.00
Options exercisable Weighted-Average Exercise Price Per Share   $ 2.15 $ 3.03 $ 2.78 $ 9.64 $ 2.70                
Options exercisable Intrinsic Value (in Dollars)     262,500 [1] 3,424,333 [1]   3,133,667 [1]                
Options granted Options Outstanding (in Shares) 2,746,400   3,246,450 [2] 93,402 [2]                    
Options granted Range of Exercise Prices $ 1.00   $ 1.80 [2] $ 9.64 [2]                    
Options granted Weighted-Average Exercise Price Per Share $ 1.00   $ 1.80 [2] $ 9.64 [2]                    
Options exercised (in Shares)       (3,333)                    
Options exercised       $ 3.20             $ 24.00 $ 9.64 $ 24.00 $ 24.00
Options cancelled or forfeited Options Outstanding (in Shares)   (82,500) (153,750) (20,167)                    
Options cancelled or forfeited Range of Exercise Prices Minimum               $ 1.80 $ 3.20 $ 1.64        
Options cancelled or forfeited Range of Exercise Prices Maximum   $ 4.93   $ 9.60               $ 24.00 $ 24.00 $ 20.00
Options cancelled or forfeited Weighted-Average Exercise Price Per Share   $ 4.93   $ 9.60               $ 24.00 $ 24.00 $ 20.00
Options Outstanding (in Shares) 6,111,127 3,679,977 3,762,477 669,777   599,875                
Outstanding Range of Exercise Prices Minimum             $ 0.88 $ 0.88 $ 0.88 $ 0.88        
Outstanding Range of Exercise Prices Maximum                     $ 24.00 $ 9.64 $ 24.00 $ 24.00
Outstanding Weighted-Average Exercise Price Per Share $ 1.57 $ 2.05 $ 2.11 $ 4.28   $ 3.62                
Outstanding Intrinsic Value (in Dollars)     $ 262,500 [1] $ 3,694,400 [1]   $ 3,742,700 [1]                
[1] Intrinsic value is calculated as the estimated fair value of the Company's stock at the end of the related period less the option exercise price of in-the-money options.
[2] All options granted during the years ended December 31, 2009 and 2010 were granted with exercise prices of $9.64 and $1.80 per share, respectively, which was deemed to be the fair market value of the Company's stock on the date of grant.