Description of Business and Basis of Presentation - Additional Information (Detail) (USD $)
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0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | |||
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Mar. 06, 2013
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Jul. 18, 2013
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Mar. 12, 2013
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Mar. 31, 2013
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Description Of Business And Basis Of Presentation [Line Items] | |||||||
Common stock, shares issued | 3,765,230 | ||||||
Common stock, par value | $ 4.35 | $ 0.0001 | $ 0.0001 | ||||
Proceeds from issuance of common stock, net of commissions and other costs of the offering | $ 15,700,000 | $ 16,400,000 | $ 15,651,000 | ||||
Gross proceeds from the offering | $ 16,400,000 | ||||||
Reverse Stock Split Ratio Description | Board of Directors of the Company approved a 1-for-30 reverse stock split of the Company's outstanding common stock | ||||||
Reverse Stock Split Ratio | 0.033 | 0.033 | |||||
Number of dilutive common shares | 0 | 0 | |||||
Minimum [Member] | Certificates of Deposit [Member]
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Description Of Business And Basis Of Presentation [Line Items] | |||||||
Certificates of deposit, maturity period | 6 months | ||||||
Maximum [Member] | Certificates of Deposit [Member]
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Description Of Business And Basis Of Presentation [Line Items] | |||||||
Certificates of deposit, maturity period | 1 year |