Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 4

-Subparagraph (SAB TOPIC 4.C)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section C

Name:	us-gaap_StockholdersEquityReverseStockSplit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Organization and Basis of Presentation - Additional Information (Detail) - Segment		3 Months Ended	12 Months Ended
	Dec. 20, 2011	Mar. 31, 2015	Dec. 31, 2014
Organization And Basis Of Presentation [Line Items]
Number of reportable segments			2
Reverse stock split	One-for-two
Subsequent Event
Organization And Basis Of Presentation [Line Items]
Number of reportable segments		4