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Convertible Promissory Notes - Additional Information (Detail) (USD $)
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1 Months Ended | 6 Months Ended | ||||
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Feb. 24, 2011
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Mar. 04, 2010
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Feb. 24, 2010
Person
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| Debt Disclosure [Line Items] | ||||||
| Principal amount of convertible promissory notes issued for accredited investors | $ 960,000 | |||||
| Number of accredited investors | 2 | |||||
| Warrants converted into common stock | 64,000 | |||||
| Common stock, par value | $ 0.001 | $ 0.001 | $ 0.001 | |||
| Net proceeds from private placement used for working capital and general corporate purposes | 900,000 | |||||
| Effective interest rate of outstanding notes | 6.53% | 6.13% | ||||
| Current conversion price of notes | $ 7.50 | |||||
| Exercise price of warrants | $ 10 | |||||
| Amortization of debt discount | 70,271 | |||||
| Promissory note, carrying amount | $ 960,000 | |||||
| Extended maturity date | Feb. 24, 2013 | |||||
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Minimum
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| Debt Disclosure [Line Items] | ||||||
| Warrants termination period | 5 years | |||||
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Convertible Notes
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| Debt Disclosure [Line Items] | ||||||
| Effective interest rate of outstanding notes | 6.00% | |||||