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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
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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 |  |  |  |  |  |

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