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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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| Product Information [Line Items] | ||||||
| Reverse stock split | 0.01258 | |||||
| Proceeds from sale of common stock | $ 25,430,000 | $ 23,975,000 | ||||
| Cash and cash equivalents, maturity description | 90 days or less | |||||
| Short-term contractual maturities | 1 year | |||||
| Restricted cash | 100,000 | 100,000 | 155,000 | |||
| Impairment losses | 0 | 0 | ||||
| Interest or penalties related to income taxes | 0 | 0 | 0 | 0 | ||
| Preferred stock outstanding | 0 | 0 | 0 | |||
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Warrants, Exercise price of $5.75 per share [Member]
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| Product Information [Line Items] | ||||||
| Proceeds from sale of common stock | $ 3,000,000 | |||||
| X | ||||||||||
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- Definition
Cash Equivalent Maturity Description No definition available.
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- Definition
Short Term Investment Contractual Maturity No definition available.
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- Definition
Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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