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Redeemable Convertible Preferred Stock - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Class of Stock [Line Items]
Completion date of issuance of series A convertible preferred stock	May 02, 2012		May 02, 2012
Amortization of discount on preferred stock	$ 11	$ 10	$ 31	$ 24
Series A Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative dividends at a rate			6.00%

X

- Definition

Amortization Of Discount On Preferred Stock

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No definition available.

+ Details

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- Definition

Completion date of issuance of series A convertible preferred stock.

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No definition available.

+ Details

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- Details

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X

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

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No definition available.

+ Details

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