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Stock-based Compensation Plan - Additional information (Detail) (USD $)
 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Apr. 23, 2010
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Apr. 23, 2010
2010
Apr. 23, 2010
2011
Apr. 23, 2010
2012
Nov. 11, 2009
Employee Stock Option
Year
Employee
Jun. 30, 2012
Employee Stock Option
Jun. 30, 2011
Employee Stock Option
Jun. 30, 2012
Employee Stock Option
Jun. 30, 2011
Employee Stock Option
Dec. 31, 2011
Employee Stock Option
Year
Nov. 11, 2009
Employee Stock Option
Options Vested
Nov. 11, 2009
Employee Stock Option
Unvested Options
Oct. 07, 2010
Independent Directors
Year
Employee
Jan. 20, 2010
Independent Directors
Year
Oct. 30, 2009
Independent Directors
Year
Employee
Jun. 30, 2012
Independent Directors
Jun. 30, 2011
Independent Directors
Jun. 30, 2012
Independent Directors
Jun. 30, 2011
Independent Directors
Oct. 31, 2009
Warrant
Jun. 30, 2012
Warrant
Jun. 30, 2011
Warrant
Jun. 30, 2012
Warrant
Jun. 30, 2011
Warrant
Aug. 13, 2010
2007 Non-Statutory Stock Option Plan
Employee Stock Option
Employee
Aug. 04, 2008
2007 Non-Statutory Stock Option Plan
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                          
Granted               290,000                40,000 40,000 130,000                    2,200,000 3,000,000
Common stock, par value   $ 0.001   $ 0.001                                                 $ 0.001
Grant date excersise price               $ 2.35                  $ 4.68 $ 1.85                    $ 3.05 $ 0.80
Vesting period               3 years               6 months 6 months 6 months                     3 years
Estimated life               5 years         5 years       5 years 5 years         5 years           5 years
Volatility percentage rate               100.00%         92.00%     87.00% 100.00% 100.00%         100.00%           100.00%
Risk free interest rate               3.84%         3.54%     3.54% 3.54% 3.54%         3.54%           2.76%
Dividend yield               0.00%         0.00%     0.00% 0.00% 0.00%         0.00%           0.00%
Grant date fair value                               $ 83,000 $ 142,000 $ 183,000                     $ 5,040,000
cancel led/forfeited                           87,000 2,030,000                            
Number of employees under plan               2               9   3                   36  
Contractual term               5         5     5 5 5                      
Grant date fair value               518,513                                          
Vesting terms According to the vesting terms, the options granted were divided into three tranches, (i) 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets its minimum revenue and earnings goals in the Company’s guidance for 2010 as delivered in its earnings releases and/or conference calls in the first quarter of 2010, such vesting to occur immediately upon completion of the annual audit confirming the financial results for 2010; and (ii) an additional 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets certain financial goals of 2011 which will be set out and decided by the Compensation Committee, such vesting to occur immediately upon Compensation Committee’s determination that the Company has met such goals for 2011; and (iii) the remaining 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets certain financial goals of 2012 which is set out and decided by the Compensation Committee, such vesting is to occur immediately upon Compensation Committee’s determination that the Company has met such goals for 2012.                                                        
Probability of achieving financial goals         100.00% 50.00% 50.00%                                            
Forfeited                          2,200,000                                 
Compensation Expense   112,814 1,445,327           87,030 332,272 112,814 1,401,352             0 2,962 0 43,975   0 0 0 0    
Options exercised                 0 0 0 0             0 0 0 0              
Compensation per month                               $ 2,000                          
Granted                                             200,000             
Exercise price                                             $ 1.50             
Vesting date                                             Jul. 01, 2010            
Expiration date                                             Oct. 01, 2014            
Exercised                                               0 0 0 0