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Stockholders' Equity and Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Director
Mar. 31, 2014
Jan. 31, 2014
Nov. 06, 2012
Class of Warrant or Right [Line Items]        
Number of current directors or stockholders as insider participants 5prmw_NumberOfCurrentDirectorsOrStockholdersAsInsiderParticipants      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 635us-gaap_ShareBasedCompensation $ 289us-gaap_ShareBasedCompensation    
Value Creation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 315us-gaap_ShareBasedCompensation
/ us-gaap_SubsidiarySaleOfStockAxis
= prmw_ValueCreationPlanMember
0us-gaap_ShareBasedCompensation
/ us-gaap_SubsidiarySaleOfStockAxis
= prmw_ValueCreationPlanMember
   
Unrecognized compensation expense related to the VCP 1,249us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_SubsidiarySaleOfStockAxis
= prmw_ValueCreationPlanMember
     
DS Services [Member]        
Class of Warrant or Right [Line Items]        
Grant of DS Services Warrant (in shares)     475us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= prmw_DsServicesMember
 
Warrants exercise price (in dollars per share)     $ 3.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ dei_LegalEntityAxis
= prmw_DsServicesMember
 
Warrants expiry date     Jan. 01, 2021  
Initial fair value of warrants issued     $ 589us-gaap_WarrantsNotSettleableInCashFairValueDisclosure
/ dei_LegalEntityAxis
= prmw_DsServicesMember
 
Comvest Warrant [Member]        
Class of Warrant or Right [Line Items]        
Grant of DS Services Warrant (in shares) 1,731us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= prmw_ComvestWarrantMember
     
Warrants exercise price (in dollars per share) $ 2.30us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= prmw_ComvestWarrantMember
    $ 1.20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= prmw_ComvestWarrantMember
Warrants expiry date Apr. 30, 2020      
Issuance of common stock (in shares) 153us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= prmw_ComvestWarrantMember
     
Partial exercises of Comvest Warrant (in shares) 200prmw_ClassOfWarrantOrRightPartiallyCashlessExerciseOfWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= prmw_ComvestWarrantMember
     
Comvest warrants outstanding (in shares) 1,131us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= prmw_ComvestWarrantMember
     
Comvest Warrant [Member] | Insider Participants [Member]        
Class of Warrant or Right [Line Items]        
Grant of DS Services Warrant (in shares) 131us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= prmw_InsiderParticipantsMember
/ us-gaap_StatementEquityComponentsAxis
= prmw_ComvestWarrantMember