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Components of Long-Term Debt (Parenthetical) (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Notes Payable | Minimum
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 24 months  
Notes Payable | Maximum
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 36 months  
Notes Payable | The principal is not subject to a fixed repayment schedule
   
Debt Instrument [Line Items]    
Long term debt, fixed interest rate 8.00% 8.00%
Notes Payable | The principal and interest is subject to a fixed blended repayment schedule of 36 months, commencing July 15, 2013.
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 36 months 36 months
Long term debt repayment starting date Jul. 15, 2013 Jul. 15, 2013
Long term debt, fixed interest rate 12.00% 12.00%
Notes Payable | The principal is subject to a fixed semi-annual repayment schedule commencing October 31, 2012 over 48 months.
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 48 months 48 months
Long term debt repayment starting date Oct. 31, 2012 Oct. 31, 2012
Long term debt, fixed interest rate 0.00% 0.00%
Long term debt, imputed interest 12.00% 12.00%
Notes Payable | The principal and interest is subject to a fixed blended repayment schedule of 36 months, commencing July 15, 2013
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 36 months 36 months
Long term debt repayment starting date Jul. 15, 2013 Jul. 15, 2013
Long term debt, fixed interest rate 12.00% 12.00%
Convertible, Senior Secured Term Debt
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 15 months  
Long term debt, fixed interest rate 13.50%  
Convertible, Senior Secured Term Debt | The principal is to be repaid over 15 months, with equal payments of principal beginning on October 15th
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 15 months 15 months
Long term debt, fixed interest rate 13.50% 13.50%
Long-term secured deferred trade payable | The principal and interest is subject to a fixed blended repayment schedule of 24 and 36 months, commencing July 15, 2013.
   
Debt Instrument [Line Items]    
Long term debt repayment starting date Jul. 15, 2013 Jul. 15, 2013
Long term debt, fixed interest rate 12.00% 12.00%
Long-term secured deferred trade payable | The principal and interest is subject to a fixed blended repayment schedule of 24 and 36 months, commencing July 15, 2013. | Minimum
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 24 months 24 months
Long-term secured deferred trade payable | The principal and interest is subject to a fixed blended repayment schedule of 24 and 36 months, commencing July 15, 2013. | Maximum
   
Debt Instrument [Line Items]    
Long term debt, fixed interest repayment term 36 months 36 months