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Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Embedded Derivative Financial Instruments | Dec. 31, 2012 Effect of a hypothetical 10% increase in the market price of common shares | Dec. 31, 2012 Warrants Issued October 2009 | Dec. 31, 2011 Warrants Issued October 2009 | Dec. 31, 2010 Warrants Issued October 2009 | Dec. 31, 2009 Warrants Issued October 2009 | Oct. 31, 2009 Warrants Issued October 2009 Y | Dec. 31, 2012 Maximum | Dec. 31, 2012 Maximum Embedded Derivative Financial Instruments | Dec. 31, 2012 Minimum Embedded Derivative Financial Instruments
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short term highly liquid instruments, maturity date |  |  |  |  |  |  |  |  |  |  | 90 days |  |
Fair value of derivative liability | $ 54,854,000 | $ 123,125,000 |  |  |  | $ 54,854,000 | $ 123,125,000 | $ 230,069,000 | $ 41,520,000 | $ 48,300,000 |  |  |
Warrant derivative liability valuation assumptions, risk-free rate |  |  |  |  |  |  |  |  |  | 2.37% |  |  |
Warrant derivative liability valuation assumptions, remaining term |  |  |  |  |  |  |  |  |  | 5 |  |  |
Warrant derivative liability valuation assumptions, volatility rate |  |  |  |  |  |  |  |  |  | 119.00% |  |  |
Warrant derivative liability fair value assumptions, risk-free rate | 0.25% | 0.36% |  |  |  |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, term | 1 year 9 months 18 days | 2 years 9 months 18 days |  |  |  |  |  |  |  |  |  | 8 years | 4 years 9 months 18 days
Warrant derivative liability fair value assumptions, volatility rate | 95.00% | 118.00% |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in the fair value of warrant derivative liability |  |  |  |  | 6,400,000 | 35,600,000 | 22,600,000 |  |  |  |  |  |
Gain (loss) on change in fair value of derivative liability | (35,344,000) | (22,669,000) | (205,153,000) | 20,000 |  | (35,367,000) | (22,669,000) |  |  |  |  |  |
Compensation (income) expense for change in fair value of warrants issued to former employees | 18,075,000 | 9,294,000 | 5,207,000 |  |  | 200,000 | (100,000) |  |  |  |  |  |
Market price of common stock | $ 8.09 |  |  |  | $ 8.90 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Derivative liability fair value assumption, coupon rate |  |  |  |  |  |  |  |  |  |  |  | 11.50% | 3.00%
Derivative liability fair value assumptions, market yields |  |  |  |  |  |  |  |  |  |  |  | 27.70% | 10.70%
Long term debt redemption feature | $ 14,600,000 |  |  | $ 14,600,000 |  |  |  |  |  |  |  |  |

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