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Promissory convertible note - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Debt Disclosure [Line Items]
Proceeds from issuance of convertible promissory notes and warrants	$ 3,000
Accrued interest rate	10.00%
Debt instrument accrued interests	$ 149
Debt instrument conversion price	$ 1
Shares issued upon conversion	3,148,833

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Increase for accrued, but unpaid interest on the debt instrument for the period.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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