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Related party transactions (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related party transactions      
Rent $ 503,995plpm_RelatedPartyTransactionRentExpenses $ 422,882plpm_RelatedPartyTransactionRentExpenses $ 500,785plpm_RelatedPartyTransactionRentExpenses
Consulting and professional fees $ 9,103plpm_RelatedPartyTransactionConsultingAndProfessionalFees $ 56,986plpm_RelatedPartyTransactionConsultingAndProfessionalFees $ 132,103plpm_RelatedPartyTransactionConsultingAndProfessionalFees
BDP Realty Corporation      
Related party transactions      
Ownership interest owned by related party (as a percent) 33.30%plpm_RelatedPartyTransactionOwnershipInterestPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= plpm_BDPRealtyCorporationMember