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Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net loss	$ (25,547)us-gaap_NetIncomeLoss	$ (10,181)us-gaap_NetIncomeLoss	$ (14,027)us-gaap_NetIncomeLoss	$ (13,880)us-gaap_NetIncomeLoss	$ (13,157)us-gaap_NetIncomeLoss
Accretion of redeemable convertible preferred stock to redemption value	(92)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment	(160)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment	(213)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment	(67)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment	(53)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Net loss attributable to common stockholders	$ (25,639)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (10,341)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (14,240)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (13,947)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (13,210)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:
Weighted average common shares outstanding, basic and diluted	8,618,793us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	728,862us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	729,001us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	709,678us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	688,946us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share attributable to common stockholders, basic and diluted	$ (2.97)us-gaap_EarningsPerShareBasicAndDiluted	$ (14.19)us-gaap_EarningsPerShareBasicAndDiluted	$ (19.53)us-gaap_EarningsPerShareBasicAndDiluted	$ (19.65)us-gaap_EarningsPerShareBasicAndDiluted	$ (19.17)us-gaap_EarningsPerShareBasicAndDiluted

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

No definition available.

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X

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Section S99

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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

-Section 03

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-Article 5



Reference 9: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256

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Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

+ References

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

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