Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v2.4.1.9
Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Commitments And Contingencies [Line Items]  
2015 $ 869us-gaap_ContractualObligationDueInNextTwelveMonths
2016 1,125us-gaap_ContractualObligationDueInSecondYear
2017 1,025us-gaap_ContractualObligationDueInThirdYear
2018 0us-gaap_ContractualObligationDueInFourthYear
2019 0us-gaap_ContractualObligationDueInFifthYear
Total 3,019us-gaap_ContractualObligationDueAfterFifthYear
Employment Contracts [Member]  
Commitments And Contingencies [Line Items]  
2015 769us-gaap_ContractualObligationDueInNextTwelveMonths
/ prph_EstimatedFutureObligationAxis
= us-gaap_EmploymentContractsMember
2016 1,025us-gaap_ContractualObligationDueInSecondYear
/ prph_EstimatedFutureObligationAxis
= us-gaap_EmploymentContractsMember
2017 1,025us-gaap_ContractualObligationDueInThirdYear
/ prph_EstimatedFutureObligationAxis
= us-gaap_EmploymentContractsMember
2018 0us-gaap_ContractualObligationDueInFourthYear
/ prph_EstimatedFutureObligationAxis
= us-gaap_EmploymentContractsMember
2019 0us-gaap_ContractualObligationDueInFifthYear
/ prph_EstimatedFutureObligationAxis
= us-gaap_EmploymentContractsMember
Total 2,819us-gaap_ContractualObligationDueAfterFifthYear
/ prph_EstimatedFutureObligationAxis
= us-gaap_EmploymentContractsMember
Godfrey Settlement Agreement [Member]  
Commitments And Contingencies [Line Items]  
2015 100us-gaap_ContractualObligationDueInNextTwelveMonths
/ prph_EstimatedFutureObligationAxis
= prph_GodfreySettlementAgreementMember
2016 100us-gaap_ContractualObligationDueInSecondYear
/ prph_EstimatedFutureObligationAxis
= prph_GodfreySettlementAgreementMember
2017 0us-gaap_ContractualObligationDueInThirdYear
/ prph_EstimatedFutureObligationAxis
= prph_GodfreySettlementAgreementMember
2018 0us-gaap_ContractualObligationDueInFourthYear
/ prph_EstimatedFutureObligationAxis
= prph_GodfreySettlementAgreementMember
2019 0us-gaap_ContractualObligationDueInFifthYear
/ prph_EstimatedFutureObligationAxis
= prph_GodfreySettlementAgreementMember
Total $ 200us-gaap_ContractualObligationDueAfterFifthYear
/ prph_EstimatedFutureObligationAxis
= prph_GodfreySettlementAgreementMember