Stockholders' Rights Plan - Additional Information (Detail)	3 Months Ended
Mar. 31, 2015
Stockholders Rights Plan [Line Items]
Investment Warrants Expiration Date	Aug. 28, 2015

Expiration date of warrants held.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column A

Name:	invest_InvestmentWarrantsExpirationDate
Namespace Prefix:	invest_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration