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Stockholders' Equity (Detail) - Summary Information About Stock Options

v2.3.0.11
Stockholders' Equity (Detail) - Summary Information About Stock Options (USD $)
 12 Months Ended
Dec. 31, 2011
Jun. 30, 2012
Dec. 31, 2010
Dec. 31, 2009
Dec. 22, 2009
Dec. 31, 2008
Range of Exercise Prices $ 2.05 $ 1.57 $ 2.11 $ 4.28   $ 3.62
Options Outstanding Number (in Shares) 3,679,977 6,111,127 3,762,477 669,777   599,875
Options Outstanding Weighted-Average Remaining Contractual Life 8 years 76 days          
Options Oustanding Weighted-Average Exercise Price $ 2.05 $ 1.57 $ 2.11 $ 4.28   $ 3.62
Options Exercisable Number (in Shares) 1,501,659   433,746 483,364   432,083
Options Exercisable Weighted-Average Exercise Price $ 2.15   $ 3.03 $ 2.78 $ 9.64 $ 2.70
$0.88 - 0.96 [Member]
            
Range of Exercise Prices Lower Limit $ 0.88          
Range of Exercise Prices $ 0.89          
Range of Exercise Prices Upper Limit $ 0.96          
Options Outstanding Number (in Shares) 287,500          
Options Outstanding Weighted-Average Remaining Contractual Life 2 years 120 days          
Options Oustanding Weighted-Average Exercise Price $ 0.89          
Options Exercisable Number (in Shares) 287,500          
Options Exercisable Weighted-Average Exercise Price $ 0.89          
$1.80 [Member]
            
Range of Exercise Prices $ 1.80          
Options Outstanding Number (in Shares) 3,195,950          
Options Outstanding Weighted-Average Remaining Contractual Life 8 years 350 days          
Options Oustanding Weighted-Average Exercise Price $ 1.80          
Options Exercisable Number (in Shares) 1,065,318          
Options Exercisable Weighted-Average Exercise Price $ 1.80          
$3.20 - 9.64 [Member]
            
Range of Exercise Prices Lower Limit $ 3.20          
Range of Exercise Prices $ 7.74          
Range of Exercise Prices Upper Limit $ 9.64          
Options Outstanding Number (in Shares) 196,527          
Options Outstanding Weighted-Average Remaining Contractual Life 4 years 9 months          
Options Oustanding Weighted-Average Exercise Price $ 7.74          
Options Exercisable Number (in Shares) 148,841          
Options Exercisable Weighted-Average Exercise Price $ 7.13