Annual report pursuant to Section 13 and 15(d)

3. Summary of Significant Accounting Policies (Details 8)

v2.4.1.9
3. Summary of Significant Accounting Policies (Details 8) (USD $)
 0 Months Ended 1 Months Ended
Sep. 03, 2014
Sep. 26, 2014
Sep. 10, 2014
Aug. 28, 2014
Jun. 04, 2014
Dec. 23, 2013
Dec. 04, 2013
Jun. 26, 2013
Apr. 11, 2013
Dec. 31, 2014
Jul. 07, 2014
Feb. 10, 2014
Jun. 30, 2014
Jun. 23, 2014
Sep. 30, 2014
Expected life (in months) 36 months 12 months 12 months 6 months 8 months 36 months 24 months 12 months 12 months            
Expected volatility 153.80%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 116.60%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 117.60%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 104.40%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 121.80%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 151.40%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 170.30%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 189.20%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 206.20%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1            
Risk-free interest rate 0.99%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.11%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.12%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.05%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.07%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.77%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.30%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.13%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.10%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1            
Exercise price $ 0.35pbio_ExercisePriceWarrants $ 0.16pbio_ExercisePriceWarrants $ 0.13pbio_ExercisePriceWarrants $ 0.14pbio_ExercisePriceWarrants $ 0.45pbio_ExercisePriceWarrants $ 0.40pbio_ExercisePriceWarrants $ 0.40pbio_ExercisePriceWarrants $ 0.17pbio_ExercisePriceWarrants $ 0.14pbio_ExercisePriceWarrants            
Fair value per warrant $ 0.24pbio_FairValuePerWarrant1 $ 0.19pbio_FairValuePerWarrant1 $ 0.12pbio_FairValuePerWarrant1 $ 0.15pbio_FairValuePerWarrant1 $ 0.16pbio_FairValuePerWarrant1 $ 0.17pbio_FairValuePerWarrant1 $ 0.16pbio_FairValuePerWarrant1 $ 0.25pbio_FairValuePerWarrant1 $ 0.29pbio_FairValuePerWarrant1            
Transaction 1 [Member]                              
Expected life (in months)                   6 months 12 months        
Expected volatility                   111.47%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionOneMember 		117.90%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionOneMember 		       
Risk-free interest rate                   0.12%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionOneMember 		0.12%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionOneMember 		       
Exercise price                   $ 0.16pbio_ExercisePriceWarrants
/ us-gaap_StatementScenarioAxis
= pbio_TransactionOneMember 		$ 0.21pbio_ExercisePriceWarrants
/ us-gaap_StatementScenarioAxis
= pbio_TransactionOneMember 		       
Fair value per warrant                   $ 0.11pbio_FairValuePerWarrant1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionOneMember 		$ 0.18pbio_FairValuePerWarrant1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionOneMember 		       
Transaction 2 [Member]                              
Expected life (in months)                   6 months 12 months        
Expected volatility                   111.47%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionTwoMember 		117.90%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionTwoMember 		       
Risk-free interest rate                   0.12%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionTwoMember 		0.12%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionTwoMember 		       
Exercise price                   $ 0.17pbio_ExercisePriceWarrants
/ us-gaap_StatementScenarioAxis
= pbio_TransactionTwoMember 		$ 0.21pbio_ExercisePriceWarrants
/ us-gaap_StatementScenarioAxis
= pbio_TransactionTwoMember 		       
Fair value per warrant                   $ 0.11pbio_FairValuePerWarrant1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionTwoMember 		$ 0.18pbio_FairValuePerWarrant1
/ us-gaap_StatementScenarioAxis
= pbio_TransactionTwoMember 		       
Conversion options revalued Three [Member]                              
Expected life (in months)                       2 months      
Expected volatility                       116.40%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedThreeMember 		     
Risk-free interest rate                       0.04%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedThreeMember 		     
Exercise price                       $ 0.25pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedThreeMember 		     
Fair value per warrant                       $ 0.2pbio_FairValuePerWarrant1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedThreeMember 		     
Conversion options revalued Four [Member]                              
Expected life (in months)                       5 months      
Expected volatility                       137.90%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedFourMember 		     
Risk-free interest rate                       0.07%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedFourMember 		     
Exercise price                       $ 0.25pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedFourMember 		     
Fair value per warrant                       $ 0.23pbio_FairValuePerWarrant1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedFourMember 		     
Conversion options revalued one [Member]                              
Expected life (in months)                         1 month    
Expected volatility                             77.10%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedOneMember
Risk-free interest rate                             0.02%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedOneMember
Exercise price                             $ 0.40pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedOneMember
Fair value per warrant                             $ 0.02pbio_FairValuePerWarrant1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedOneMember
Conversion options revalued Two [Member]                              
Expected life (in months)                           30 months  
Expected volatility                           159.20%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedTwoMember 		 
Risk-free interest rate                           0.73%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedTwoMember 		 
Exercise price                           $ 0.40pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedTwoMember 		 
Fair value per warrant                           $ 0.32pbio_FairValuePerWarrant1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedTwoMember 		 
Conversion options revalued Six [Member]                              
Expected life (in months)                   1 month          
Expected volatility                   77.40%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedSixMember 		         
Risk-free interest rate                   0.03%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedSixMember 		         
Exercise price                   $ 0.45pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedSixMember 		         
Fair value per warrant                               
Conversion options revalued Eight [Member]                              
Expected life (in months)                   2 months          
Expected volatility                   121.70%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedEightMember 		         
Risk-free interest rate                   0.04%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedEightMember 		         
Exercise price                   $ 0.15pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedEightMember 		         
Fair value per warrant                   $ 0.11pbio_FairValuePerWarrant1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedEightMember 		         
Conversion options revalued Nine [Member]                              
Expected life (in months)                   32 months          
Expected volatility                   154.10%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedNineMember 		         
Risk-free interest rate                   0.88%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedNineMember 		         
Exercise price                   $ 0.35pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedNineMember 		         
Fair value per warrant                   $ 0.19pbio_FairValuePerWarrant1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedNineMember 		         
Conversion options revalued Ten [Member]                              
Expected life (in months)                   8 months          
Expected volatility                   106.60%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedTenMember 		         
Risk-free interest rate                   0.18%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedTenMember 		         
Exercise price                   $ 0.14pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedTenMember 		         
Fair value per warrant                   $ 0.14pbio_FairValuePerWarrant1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedTenMember 		         
Conversion options revalued Eleven [Member]                              
Expected life (in months)                   9 months          
Expected volatility                   106.20%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedElevenMember 		         
Risk-free interest rate                   0.17%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedElevenMember 		         
Exercise price                   $ 0.15pbio_ExercisePriceWarrants
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedElevenMember 		         
Fair value per warrant                   $ 0.13pbio_FairValuePerWarrant1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= pbio_ConversionOptionsRevaluedElevenMember