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Stockholders' Equity - Financial Liabilities Subject to Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
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Sep. 30, 2012
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Dec. 31, 2011
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August 2008 Warrants [Member]
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|
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| Class of Warrant or Right [Line Items] |
|
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| Financial Liabilities subject to fair value measurements |
$ 17,099
|
$ 1,292
|
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October 2009 Warrants [Member]
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| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
24,570
|
3,738
|
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March 2011 Warrants [Member]
|
|
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| Class of Warrant or Right [Line Items] |
|
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| Financial Liabilities subject to fair value measurements |
25,704
|
4,179
|
|
Total Common Stock Warrants [Member]
|
|
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| Class of Warrant or Right [Line Items] |
|
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| Financial Liabilities subject to fair value measurements |
67,373
|
9,209
|
|
Basis of Fair Value Measurements Level 1 [Member] | August 2008 Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
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| Financial Liabilities subject to fair value measurements |
|
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|
Basis of Fair Value Measurements Level 1 [Member] | October 2009 Warrants [Member]
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|
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| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
|
|
|
Basis of Fair Value Measurements Level 1 [Member] | March 2011 Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
|
|
|
Basis of Fair Value Measurements Level 1 [Member] | Total Common Stock Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
|
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Basis of Fair Value Measurements Level 2 [Member] | August 2008 Warrants [Member]
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|
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| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
|
|
|
Basis of Fair Value Measurements Level 2 [Member] | October 2009 Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
|
|
|
Basis of Fair Value Measurements Level 2 [Member] | March 2011 Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
|
|
|
Basis of Fair Value Measurements Level 2 [Member] | Total Common Stock Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
|
|
|
Basis of Fair Value Measurements Level 3 [Member] | August 2008 Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
17,099
|
1,292
|
|
Basis of Fair Value Measurements Level 3 [Member] | October 2009 Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
24,570
|
3,738
|
|
Basis of Fair Value Measurements Level 3 [Member] | March 2011 Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
25,704
|
4,179
|
|
Basis of Fair Value Measurements Level 3 [Member] | Total Common Stock Warrants [Member]
|
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Financial Liabilities subject to fair value measurements |
$ 67,373
|
$ 9,209
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