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Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 28, 2013
Jun. 30, 2013
Maximum
Jun. 03, 2013
Embedded Derivative Financial Instruments
Jun. 30, 2013
Embedded Derivative Financial Instruments
Dec. 31, 2012
Embedded Derivative Financial Instruments
Jun. 03, 2013
Embedded Derivative Financial Instruments
Maximum
Dec. 31, 2012
Embedded Derivative Financial Instruments
Maximum
Jun. 03, 2013
Embedded Derivative Financial Instruments
Minimum
Dec. 31, 2012
Embedded Derivative Financial Instruments
Minimum
Jun. 30, 2013
Foreign Exchange Forward
Jun. 30, 2013
Foreign Exchange Forward
Other Current Liabilities
Jun. 30, 2013
Effect of a hypothetical 10% increase in the market price of common shares
Jun. 28, 2013
Effect of a hypothetical 10% increase in the market price of common shares
Jun. 30, 2013
Warrant
Dec. 31, 2012
Warrant
Jun. 30, 2013
Warrants Issued October 2009
Significant Accounting Policies [Line Items]                                          
Sales discount percentage 2.00%   2.00%                                    
Sales discount term     30 days                                    
Short term highly liquid instruments, maturity date             90 days                            
Warrant derivative liability                                     $ 36,000,000 $ 54,854,000  
Warrant derivative liability fair value assumptions, risk-free rate     0.20%   0.25%                                
Derivative liability fair value assumptions, term     1 year 3 months 18 days   1 year 9 months 18 days           7 years 1 month 6 days 8 years 3 years 9 months 18 days 4 years 9 months 18 days              
Warrant derivative liability fair value assumptions, volatility rate     94.00%   95.00%                                
Increase (Decrease) in the fair value of warrant derivative liability                                 4,600,000       (18,900,000)
Gain (loss) on change in fair value of derivative liabilities 18,841,000 (18,930,000) 22,461,000 (85,139,000)       6,000,000               900,000         17,400,000
Compensation income for change in fair value of warrants issued to former employees                                         1,500,000
Market price of common stock           $ 5.80                       $ 6.38      
Hypothetical increase in market price of common shares     10.00%                                    
Change of control obligation                   140,000,000                      
Maximum repayment of future revenue and receivables                   150,000,000                      
Long term debt redemption feature         14,600,000       8,600,000 14,600,000                      
Derivative liability fair value assumption, coupon rate                     12.50% 11.50% 9.90% 3.00%              
Derivative liability fair value assumptions, market yields                     26.00% 27.70% 10.80% 10.70%              
Notional amounts, foreign exchange forward contracts                             9,000,000            
Net fair value, foreign exchange forward contracts                             $ 900,000