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Promissory convertible note - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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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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