Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB

-Name Accounting Standards Codification

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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-Glossary Cash Equivalents

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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-Name Accounting Standards Codification

-Topic 210

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Fair Value Measurements and Fair Value of Financial Instruments - Financial Assets Measured and Recognized at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Total assets	$ 40,000us-gaap_AssetsFairValueDisclosure
Liabilities:
Total liabilities		133
Common Stock [Member] \| Warrants [Member]
Liabilities:
Total liabilities		42
Total liabilities		42
Series A and B Convertible Preferred Stock [Member] \| Warrants [Member]
Liabilities:
Total liabilities		91
Total liabilities		91
Money Market Funds [Member]
Assets:
Total assets	40,000
Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Total assets	40,000
Quoted Prices in Active Markets (Level 1) [Member] \| Money Market Funds [Member]
Assets:
Total assets	40,000
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Total liabilities		133
Significant Unobservable Inputs (Level 3) [Member] \| Common Stock [Member] \| Warrants [Member]
Liabilities:
Total liabilities		42
Significant Unobservable Inputs (Level 3) [Member] \| Series A and B Convertible Preferred Stock [Member] \| Warrants [Member]
Liabilities:
Total liabilities		$ 91