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Retirement Plan - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Percentage of employer's contribution on employee's base salary	2.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent		2.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Contribution expense	$ 43us-gaap_DefinedContributionPlanCostRecognized	$ 20us-gaap_DefinedContributionPlanCostRecognized	$ 26us-gaap_DefinedContributionPlanCostRecognized	$ 16us-gaap_DefinedContributionPlanCostRecognized	$ 15us-gaap_DefinedContributionPlanCostRecognized

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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