Net Loss Per Share - Additional Information (Detail) (A Preference Shares [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
A Preference Shares [Member]
Earnings Per Share, Basic, Two Class Method [Abstract]
Cumulative dividend included in net loss for EPS calculation	$ 0

Amount of cumulative cash dividends distributed to shareholders.

No definition available.

Name:	us-gaap_CumulativeDividends
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant