Subsequent Event - Additional Information (Detail)	Feb. 08, 2018
Subsequent Event [Line Items]
Stockholders' Equity, Reverse Stock Split	1-for-10
Subsequent Event [Member]
Subsequent Event [Line Items]
Stockholders' Equity, Reverse Stock Split	1-for-10

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

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