Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Details)

v2.4.1.9
Shareholders' Equity (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Class of Warrant or Right [Line Items]    
Number of warrants exercised 8,966,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised  
Number of warrants Warrants outstanding, December 31, 2013 (As restated) 8,966,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber  
Warrant [Member]    
Class of Warrant or Right [Line Items]    
Number of warrants outstanding, December 31, 2012 (As restated) 8,966,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
  
Number of warrants granted    8,966,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Number of warrants warrants expired/terminated/forfeited      
Number of warrants exercised      
Number of warrants Warrants outstanding, December 31, 2013 (As restated) 8,966,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
8,966,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Average exercise price per share warrants outstanding, December 31, 2013 (As restated) $ 12.00pme_WeightedAverageExercisePriceOfWarrantsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
  
Average exercise price per share Warrants granted    $ 12.00pme_WeightedAverageExercisePriceOfWarrantsGranted
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Average exercise price per share Warrants expired/terminated/forfeited      
Average exercise price per share warrants exercised      
Average exercise price per share warrants outstanding, December 31, 2014 $ 12.00pme_WeightedAverageExercisePriceOfWarrantsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
$ 12.00pme_WeightedAverageExercisePriceOfWarrantsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember