Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Fair Value Measurements - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Jul. 22, 2013	Dec. 31, 2013	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Goodwill impairment charge	$ 21,900,000us-gaap_GoodwillImpairmentLoss	$ 21,864,781us-gaap_GoodwillImpairmentLoss
Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Assets			$ 0