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Redeemable Convertible Preferred Stock - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Accretion amount	$ 12us-gaap_PreferredStockAccretionOfRedemptionDiscount	$ 11us-gaap_PreferredStockAccretionOfRedemptionDiscount

X

- Details

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

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- Definition

The amount of accretion of the preferred stock redemption discount during the period.

+ References

No definition available.

+ Details

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