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Liquidity Matters - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||
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Oct. 30, 2012
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Aug. 31, 2012
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Dec. 31, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Mar. 07, 2012
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Dec. 31, 2012
Revolving promissory note
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Mar. 07, 2012
Revolving promissory note
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Oct. 31, 2011
Revolving promissory note
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Jun. 30, 2012
Private Placement [Member]
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Dec. 31, 2012
Subsequent Event [Member]
Revolving promissory note
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Sep. 24, 2012
Subsequent Event [Member]
Revolving promissory note
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Oct. 30, 2012
Subsequent Event [Member]
Private Placement [Member]
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| Cash Cash Equivalents Short Term Investments and Restricted Investments [Line Items] | |||||||||||||
| Shares of common stocks issued | 100,000 | 241,436 | 2,535,093 | 1,207,185 | 241,437 | ||||||||
| Warrants issued | 48,297 | 507,019 | 48,287 | ||||||||||
| Warrant term | 5 years | 5 years | 5 years | ||||||||||
| Net proceeds from issuance of common stock and warrants | $ 4,000 | $ 77,000 | $ 981,000 | $ 0 | |||||||||
| Debt instrument, principal amount | $ 1,450,000 | $ 1,450,000 | $ 250,000 | $ 450,000 | $ 250,000 | $ 1,000,000 | $ 285,000 | $ 1,500,000 | |||||