Annual report pursuant to Section 13 and 15(d)

2. Summary of Significant Accounting Policies (Details 2)

v2.4.1.9
2. Summary of Significant Accounting Policies (Details 2) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Numerator:    
Net loss $ (4,612,540)us-gaap_ProfitLoss $ (4,084,427)us-gaap_ProfitLoss
Beneficial conversion feature for preferred stock (1,495,415)pbio_BeneficialConversionFeatureForPreferredStock (1,002,602)pbio_BeneficialConversionFeatureForPreferredStock
Preferred dividends accrued (143,771)pbio_PreferredDividendsAccrued (100,420)pbio_PreferredDividendsAccrued
Preferred dividends paid in cash 0pbio_PreferredDividendsPaidInCash (60,000)pbio_PreferredDividendsPaidInCash
Net loss applicable to common shareholders $ (6,251,726)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (5,247,449)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator for basic and diluted loss per share:    
Weighted average common stock shares outstanding 14,264,753us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 11,821,870us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Loss per common share - basic and diluted $ (0.44)us-gaap_EarningsPerShareBasicAndDiluted $ (0.44)us-gaap_EarningsPerShareBasicAndDiluted