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Customer Deposits - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Deposit Liabilities [Line Items]    
Customer deposits $ 658us-gaap_CustomerDepositsCurrent $ 658us-gaap_CustomerDepositsCurrent
Nuclear Pharm Assist Systems    
Deposit Liabilities [Line Items]    
Customer deposits $ 658,000us-gaap_CustomerDepositsCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= posc_NuclearPharmAssistSystemsMember		 $ 658,000us-gaap_CustomerDepositsCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= posc_NuclearPharmAssistSystemsMember
Number of systems, orders placed 5posc_NumberOfSystemsForWhichOrdersPlaced
/ us-gaap_StatementBusinessSegmentsAxis
= posc_NuclearPharmAssistSystemsMember		 5posc_NumberOfSystemsForWhichOrdersPlaced
/ us-gaap_StatementBusinessSegmentsAxis
= posc_NuclearPharmAssistSystemsMember