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Fair Value Measurements - Additional Information (Detail) (USD $) In Thousands, except Share data in Millions, unless otherwise specified | 9 Months Ended |
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Sep. 30, 2014 | Dec. 31, 2013
Fair Value Disclosures [Abstract] |  |
Maximum maturity period of collateralized securities | 1 year |
Warrant liability | $ 3,975 | $ 214
Common stock warrants issued, classified as liabilities | 3.5 |
Maximum maturity period of cash and cash equivalents | 90 days |
Maximum maturity period of short-term investments | 1 year |

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- Definition Maximum maturity period of cash and cash equivalents. + References No definition available. + Details
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- Definition Maximum maturity period of collateralized securities. + References No definition available. + Details
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- Definition Maximum maturity period of short term investments. + References No definition available. + Details
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- Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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