Quarterly report pursuant to Section 13 or 15(d)

3. Summary of Significant Accounting Policies (Details 6)

v2.4.1.9
3. Summary of Significant Accounting Policies (Details 6) (USD $)
 1 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Nov. 10, 2011
Mar. 26, 2015
Mar. 20, 2015
Mar. 09, 2015
Mar. 04, 2015
Feb. 25, 2015
Nov. 17, 2014
Nov. 10, 2014
Sep. 26, 2014
Sep. 10, 2014
Sep. 03, 2014
Aug. 28, 2014
Summary Of Significant Accounting Policies Details 6                            
Expected life (in months) 19 months 22 months 60 months                      
Expected volatility 124.40%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 116.00%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 104.50%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 143.20%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 140.90%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 139.20%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 138.90%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 132.10%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 117.90%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 104.20%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 116.60%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 117.60%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 153.80%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1 104.40%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate1
Risk-free interest rate 0.31%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.58%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.875%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.07%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.08%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.08%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.08%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.08%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.12%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.10%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.11%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.12%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.99%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1 0.05%pbio_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate1
Exercise price $ 0.25pbio_ExercisePriceWarrants $ 0.25pbio_ExercisePriceWarrants $ 0.81pbio_ExercisePriceWarrants $ 0.18pbio_ExercisePriceWarrants $ 0.20pbio_ExercisePriceWarrants $ 0.20pbio_ExercisePriceWarrants $ 0.17pbio_ExercisePriceWarrants $ 0.10pbio_ExercisePriceWarrants $ 0.17pbio_ExercisePriceWarrants $ 0.13pbio_ExercisePriceWarrants $ 0.16pbio_ExercisePriceWarrants $ 0.13pbio_ExercisePriceWarrants $ 0.35pbio_ExercisePriceWarrants $ 0.14pbio_ExercisePriceWarrants
Fair value per warrant $ 0.20pbio_FairValuePerWarrant1 $ 0.15pbio_FairValuePerWarrant1 $ 0.54pbio_FairValuePerWarrant1 $ 0.20pbio_FairValuePerWarrant1 $ 0.20pbio_FairValuePerWarrant1 $ 0.13pbio_FairValuePerWarrant1 $ 0.17pbio_FairValuePerWarrant1 $ 0.28pbio_FairValuePerWarrant1 $ 0.20pbio_FairValuePerWarrant1 $ 0.23pbio_FairValuePerWarrant1 $ 0.19pbio_FairValuePerWarrant1 $ 0.17pbio_FairValuePerWarrant1 $ 0.24pbio_FairValuePerWarrant1 $ 0.15pbio_FairValuePerWarrant1