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Derivative Instruments - Additional Information (Detail) (USD $)
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2013
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Jun. 30, 2013
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Jan. 12, 2011
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
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|
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| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Fair value assumption conversion price |
$ 1.25 |
$ 1.25 |
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| Expected volatility rate |
|
160.00% |
|
| Remaining term of expected volatility |
|
4 years 3 months 18 days |
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| Risk-free interest rate |
|
1.12% |
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| Fair value of embedded conversion feature Increased/Decreased |
$ 10,800,000 |
$ 10,600,000 |
|
| Issuance of common stock |
10,000,000 |
10,000,000 |
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|
Amended and Restated Reimbursement Notes [Member]
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|
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
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|
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| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
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| Fair value assumption conversion price |
$ 0.50 |
$ 0.50 |
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| Expected volatility rate |
|
184.00% |
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| Remaining term of expected volatility |
|
10 months |
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| Risk-free interest rate |
|
0.15% |
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| Fair value of embedded conversion feature Increased/Decreased |
|
39,000 |
|
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Amended and Restated Bridge Notes [Member]
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|
|
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
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|
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| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Fair value assumption conversion price |
$ 0.50 |
$ 0.50 |
|
| Expected volatility rate |
|
160.00% |
|
| Remaining term of expected volatility |
|
4 years 3 months 18 days |
|
| Risk-free interest rate |
|
1.12% |
|
| Fair value of embedded conversion feature Increased/Decreased |
|
57,000 |
|
|
Amended and Restated August 2009 Warrants [Member]
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|
|
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
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|
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| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
144.41% |
|
| Remaining term of expected volatility |
|
6 years 1 month 6 days |
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| Risk-free interest rate |
|
1.41% |
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| Number of warrants sold to MHR |
|
3,700,000 |
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| Warrants exercised with exercise price |
|
$ 0.50 |
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| Fair value assumption exercise price |
$ 0.50 |
$ 0.50 |
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| Fair value of warrants increased |
330,000 |
290,000 |
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| Warrants expiry date |
|
Jul.
08,
2019 |
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|
Amended and Restated August 2010 Warrants [Member]
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|
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
|
|
|
| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
144.41% |
|
| Remaining term of expected volatility |
|
6 years 1 month 6 days |
|
| Risk-free interest rate |
|
1.41% |
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| Number of warrants sold to MHR |
|
2,600,000 |
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| Assumption exercise price |
|
$ 0.50 |
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| Fair value of warrants decreased |
|
200,000 |
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|
Amended and Restated June 2010 Warrants [Member]
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|
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
|
|
|
| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
145.00% |
|
| Remaining term of expected volatility |
|
6 years 1 month 6 days |
|
| Risk-free interest rate |
|
1.67% |
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| Issuance of common stock |
10,000,000 |
10,000,000 |
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| Warrants exercised with exercise price |
|
$ 0.50 |
|
| Fair value of warrants increased |
|
20,000 |
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| Warrants expiry date |
|
Jul.
08,
2019 |
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| Number of warrants issued |
865,000 |
865,000 |
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| Warrants extended expiry date |
|
Jul.
08,
2019 |
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| Reduced exercise price of warrants |
|
$ 0.50 |
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August 2010 Investor Warrants [Member]
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|
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
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|
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| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
187.43% |
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| Remaining term of expected volatility |
|
2 years 2 months |
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| Risk-free interest rate |
|
0.36% |
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| Number of warrants sold to MHR |
|
2,600,000 |
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| Warrants expiry date |
|
Aug. 26,
2015 |
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| Assumption exercise price |
|
$ 1.26 |
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| Fair value of warrants decreased |
100,000 |
100,000 |
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| Exercise price of the warrants issued |
|
$ 1.26 |
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| Number of warrants exercised by unrelated investors |
|
|
200,000 |
|
Amended and Restated August 2010 MHR Waiver Warrants [Member]
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|
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
|
|
|
| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
144.41% |
|
| Remaining term of expected volatility |
|
6 years 1 month 6 days |
|
| Risk-free interest rate |
|
1.41% |
|
| Number of warrants sold to MHR |
|
975,000 |
|
| Fair value of warrants increased |
100,000 |
100,000 |
|
| Warrants extended expiry date |
|
Jul.
08,
2019 |
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| Reduced exercise price of warrants |
|
$ 0.50 |
|
| Assumption exercise price |
|
$ 0.50 |
|
|
Amended and Restated July 2011 Warrants [Member]
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|
|
|
| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
|
|
|
| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
144.41% |
|
| Remaining term of expected volatility |
|
6 years 1 month 6 days |
|
| Risk-free interest rate |
|
1.41% |
|
| Number of warrants sold to MHR |
|
3,010,000 |
|
| Fair value of warrants increased |
200,000 |
200,000 |
|
| Warrants extended expiry date |
|
Jul.
08,
2019 |
|
| Reduced exercise price of warrants |
|
$ 0.50 |
|
| Assumption exercise price |
|
$ 0.50 |
|
|
July 2011 Investor Warrants [Member]
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|
|
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
|
|
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| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
178.06% |
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| Remaining term of expected volatility |
|
3 years 1 month 6 days |
|
| Risk-free interest rate |
|
0.36% |
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| Warrants expiry date |
|
Jul.
06,
2016 |
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| Number of warrants issued |
3,010,000 |
3,010,000 |
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| Assumption exercise price |
|
$ 1.09 |
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| Fair value of warrants decreased |
100,000 |
100,000 |
|
| Exercise price of the warrants issued |
|
$ 1.09 |
|
|
Amended and Restated July 2011 MHR Waiver Warrants [Member]
|
|
|
|
| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
|
|
|
| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
144.41% |
|
| Remaining term of expected volatility |
|
6 years 1 month 6 days |
|
| Risk-free interest rate |
|
1.41% |
|
| Number of warrants sold to MHR |
|
795,000 |
|
| Fair value of warrants increased |
100,000 |
100,000 |
|
| Warrants extended expiry date |
|
Jul.
08,
2019 |
|
| Reduced exercise price of warrants |
|
$ 0.50 |
|
| Assumption exercise price |
|
$ 0.50 |
|
|
2013 Restructuring Warrants [Member]
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| Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |
|
|
|
| Fair value assumption stock price |
$ 0.20 |
$ 0.20 |
|
| Expected volatility rate |
|
144.41% |
|
| Remaining term of expected volatility |
|
6 years 1 month 6 days |
|
| Risk-free interest rate |
|
1.41% |
|
| Fair value of embedded conversion feature Increased/Decreased |
|
$ 300,000 |
|
| Reduced exercise price of warrants |
|
$ 0.50 |
|
| Assumption exercise price |
|
$ 0.50 |
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| Inception date |
|
May
07,
2014 |
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