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Summary of Convertible Debt and Initial Accounting of Issuances (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]    
Proceeds from convertible debt issuance $ 320us-gaap_ProceedsFromConvertibleDebt $ 0us-gaap_ProceedsFromConvertibleDebt
Allocation of proceeds to embedded conversion derivative liability 320us-gaap_ProceedsFromConvertibleDebt 0us-gaap_ProceedsFromConvertibleDebt
Embedded Conversion Derivative Liability    
Debt Instrument [Line Items]    
Proceeds from convertible debt issuance 320us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= posc_EmbeddedConversionDerivativeLiabilityMember		  
Allocation of proceeds to embedded conversion derivative liability $ 320us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= posc_EmbeddedConversionDerivativeLiabilityMember