Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) (USD $)
3 Months Ended 6 Months Ended 84 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Stockholders' Equity          
Stockholders' equity at beginning of period     $ 38,068,058us-gaap_StockholdersEquity $ 4,739,124us-gaap_StockholdersEquity  
Net loss (4,618,237)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (2,600,429)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (8,679,353)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (4,651,915)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (34,000,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Stock-based compensation     1,016,771us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 292,398us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue  
Common stock issued for services     30,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 150,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation  
Exercise of common stock warrants     775,257oncs_StockIssuedDuringPeriodValueExerciseOfWarrants 7,145,636oncs_StockIssuedDuringPeriodValueExerciseOfWarrants  
Public offering on September 18, 2013, net of issuance costs of $836,360       11,111,640us-gaap_StockIssuedDuringPeriodValueNewIssues  
Exercise of stock options     1,738us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 108,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised  
Stockholders' equity at end of period 31,212,471us-gaap_StockholdersEquity 18,894,883us-gaap_StockholdersEquity 31,212,471us-gaap_StockholdersEquity 18,894,883us-gaap_StockholdersEquity 31,212,471us-gaap_StockholdersEquity
Issuance costs       $ 836,360us-gaap_PaymentsOfStockIssuanceCosts