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Reconciliation of Financial Instruments Recognized at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Balance of embedded conversion derivative liability as of December 31, 2013 $ 6,968us-gaap_DerivativeLiabilities
Fair value of embedded conversion derivative liabilities at issuance 320posc_IncreaseDecreaseInFairValueOfDerivativeLiabilities
Gain on fair value adjustments to embedded conversion derivative liability (220)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Reductions in fair value do to conversion of convertible debentures into common stock payable (3,447)posc_ReductionsInFairValueConversionOfConvertibleDebenturesIntoCommonStockPayable
Balance of embedded conversion derivative liability at March 31, 2014 $ 3,621us-gaap_DerivativeLiabilities