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Convertible Notes Payable (Detail) - Convertible Notes Payable by Liability Classification (USD $)
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Dec. 31, 2011
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Sep. 30, 2011
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Apr. 30, 2011
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Dec. 31, 2010
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Nov. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
Debt, Current [Member]
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Dec. 31, 2011
Debt, Current [Member]
Convertible Note Payable [Member]
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Dec. 31, 2011
Debt, Current [Member]
Convertible Note Payable [Member]
March 2010 Notes [Member]
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Dec. 31, 2011
Debt, Current [Member]
March 2010 Notes [Member]
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Jun. 30, 2012
Debt, Long-term [Member]
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Dec. 31, 2011
Debt, Long-term [Member]
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Jun. 30, 2012
Debt, Long-term [Member]
Convertible Note Payable [Member]
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Dec. 31, 2011
Debt, Long-term [Member]
Convertible Note Payable [Member]
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Dec. 31, 2011
Debt, Long-term [Member]
Convertible Note Payable [Member]
2011 Unit Offering Notes [Member]
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Jun. 30, 2012
Debt, Long-term [Member]
Convertible Note Payable [Member]
April 2011 Note [Member]
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Dec. 31, 2011
Debt, Long-term [Member]
Convertible Note Payable [Member]
April 2011 Note [Member]
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Dec. 31, 2011
Debt, Long-term [Member]
2011 Unit Offering Notes [Member]
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Jun. 30, 2012
Debt, Long-term [Member]
April 2011 Note [Member]
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Dec. 31, 2011
Debt, Long-term [Member]
April 2011 Note [Member]
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Convertible notes payable, principal | $ 4,071,000 | $ 4,071,000 | $ 2,000,000 | $ 3,625,000 | $ 1,625,000 | $ 2,000,000 | $ 2,000,000 | |||||||||||||
| Convertible notes payable, unamortized discount | 653,236 | 2,775,300 | (117,405) | (117,405) | (316,610) | (316,610) | ||||||||||||||
| Convertible notes payable, net | $ 3,805,500 | $ 1,310,000 | $ 2,000,000 | $ 4,071,000 | $ 3,953,595 | $ 3,953,595 | $ 2,000,000 | $ 3,308,390 | $ 1,308,390 | $ 2,000,000 | $ 2,000,000 |