Fair Value Measurements Fair Falue of Outstanding Common Stock Warrants (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Stock price	$ 16.25us-gaap_SharePrice	$ 22.30us-gaap_SharePrice
Weighted average exercise price	$ 0.10	$ 0.10
Term (years)	7 years 8 months 0 days	8 years 8 months 1 day
Risk-free rate	2.01%	2.78%
Expected volatility	50.20%	52.90%
Historical volatilities period	10 years
Fair value of common stock warrants	$ 16.17	$ 21.64

Fair Value Assumptions Historical Volatilities Period

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- Definition

Per share fair value of warrants not settleable in cash.

+ References

No definition available.

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- Definition

Agreed upon price for the exchange of the underlying asset.

+ 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 (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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