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Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 28, 2013 | Dec. 31, 2011
Significant Accounting Policies [Line Items] |  |  |  |  |
Sales discount percentage | 2.00% |  |  |  |
Sales discount term | 30 days |  |  |  |
Warrant derivative liability | $ 65,359,000 | $ 191,387,000 | $ 69,430,000 |  | $ 123,125,000
Warrant derivative liability fair value assumptions, risk-free rate | 0.20% |  | 0.25% |  |
Derivative liability fair value assumptions, term | 1 year 6 months |  | 1 year 9 months 18 days |  |
Warrant derivative liability fair value assumptions, volatility rate | 94.00% |  | 95.00% |  |
Gain (loss) on change in fair value of derivative liabilities | 3,620,000 | (66,209,000) |  |  |
Compensation income for change in fair value of warrants issued to former employees | 4,874,000 | 3,874,000 |  |  |
Market price of common stock |  |  |  | $ 7.41 |
Hypothetical increase in market price of common shares | 10.00% |  |  |  |
Long term debt redemption feature | 14,600,000 |  |  |  |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Short term highly liquid instruments, maturity date | 90 days |  |  |  |
Embedded Derivative Financial Instruments |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Warrant derivative liability | 15,600,000 |  | 14,576,000 |  |
Gain (loss) on change in fair value of derivative liabilities | 1,000,000 |  |  |  |
Change of control obligation |  |  | 140,000,000 |  |
Maximum repayment of future revenue and receivables |  |  | 150,000,000 |  |
Long term debt redemption feature | 15,600,000 |  | 14,600,000 |  |
Embedded Derivative Financial Instruments | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative liability fair value assumptions, term | 7 years 4 months 24 days |  | 8 years |  |
Derivative liability fair value assumption, coupon rate | 11.90% |  | 11.50% |  |
Derivative liability fair value assumptions, market yields | 25.60% |  | 27.70% |  |
Embedded Derivative Financial Instruments | Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Derivative liability fair value assumptions, term | 4 years |  | 4 years 9 months 18 days |  |
Derivative liability fair value assumption, coupon rate | 9.90% |  | 3.00% |  |
Derivative liability fair value assumptions, market yields | 12.30% |  | 10.70% |  |
Foreign Exchange Forward |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Notional amounts, foreign exchange forward contracts | 15,000,000 |  |  |  |
Net fair value, foreign exchange forward contracts | 700,000 |  |  |  |
Foreign Exchange Forward | Other Current Liabilities |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Gain (loss) on change in fair value of derivative liabilities | 700,000 |  |  |  |
Effect of a hypothetical 10% increase in the market price of common shares |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Increase (Decrease) in the fair value of warrant derivative liability | 5,900,000 |  |  |  |
Market price of common stock |  |  |  | $ 8.15 |
Warrant |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Warrant derivative liability | 49,011,000 |  | 54,854,000 |  |
Warrants Issued October 2009 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Increase (Decrease) in the fair value of warrant derivative liability | (5,900,000) |  |  |  |
Gain (loss) on change in fair value of derivative liabilities | 5,400,000 |  |  |  |
Compensation income for change in fair value of warrants issued to former employees | $ 500,000 |  |  |  |

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