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Stock-Based Compensation (Details) (USD $)
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3 Months Ended |
9 Months Ended |
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Apr. 30, 2015
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Apr. 30, 2014
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Apr. 30, 2015
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Apr. 30, 2014
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| Stock-based compensation |
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| Expected volatility, minimum (as a percent) |
87.68%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
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88.65%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
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87.68%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
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83.62%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
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| Expected volatility, maximum (as a percent) |
117.51%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
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91.96%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
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117.51%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
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92.52%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
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| Risk-free interest rate, minimum (as a percent) |
0.87%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
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1.46%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
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0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
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0.69%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
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| Risk-free interest rate, maximum (as a percent) |
1.86%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
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2.78%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
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2.13%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
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2.78%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
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| Expected forfeiture rate (as a percent) |
0.00%oncs_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
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0.00%oncs_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
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0.00%oncs_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
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0.00%oncs_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
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| Stock-based compensation expense recognized |
$ 628,000us-gaap_AllocatedShareBasedCompensationExpense
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$ 1,105,000us-gaap_AllocatedShareBasedCompensationExpense
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$ 1,700,000us-gaap_AllocatedShareBasedCompensationExpense
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$ 1,397,000us-gaap_AllocatedShareBasedCompensationExpense
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| Minimum |
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| Stock-based compensation |
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| Expected term |
3 years
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5 years
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2 years
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3 years
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| Maximum |
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| Stock-based compensation |
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| Expected term |
6 years 6 months
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10 years
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6 years 6 months
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10 years
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| Research and development expense. |
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| Stock-based compensation |
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| Stock-based compensation expense recognized |
279,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
|
374,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
|
761,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
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536,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
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| General and administrative expenses. |
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| Stock-based compensation |
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| Stock-based compensation expense recognized |
$ 349,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
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$ 731,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
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$ 949,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
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$ 861,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
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| 2011 Plan | Employees |
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| Stock-based compensation |
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| Term of stock options |
10 years
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10 years
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| Options granted to purchase shares |
184,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
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|
338,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
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| Vesting period |
3 years
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| Exercise price, low end of the range (in dollars per share) |
$ 6.60us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
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$ 7.30us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
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| Exercise price, high end of the range (in dollars per share) |
$ 7.60us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
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$ 10.60us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
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| 2011 Plan | Employees | Minimum |
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| Stock-based compensation |
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| Vesting period |
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1 year
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| 2011 Plan | Employees | Maximum |
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| Stock-based compensation |
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| Vesting period |
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3 years
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| 2011 Plan | Consultants |
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| Stock-based compensation |
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| Options granted to purchase shares |
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30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_ConsultantsMember
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| Exercise price, low end of the range (in dollars per share) |
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$ 6.60us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_ConsultantsMember
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| Exercise price, high end of the range (in dollars per share) |
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$ 8.60us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_ConsultantsMember
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| 2011 Plan | Consultants | Minimum |
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| Stock-based compensation |
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| Term of stock options |
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1 year
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| 2011 Plan | Consultants | Maximum |
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| Stock-based compensation |
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| Term of stock options |
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3 years
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| 2011 Plan | Employees and directors |
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| Stock-based compensation |
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| Term of stock options |
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10 years
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| Options granted to purchase shares |
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111,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeAndDirectorMember
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| Exercise price, low end of the range (in dollars per share) |
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$ 9.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeAndDirectorMember
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| Exercise price, high end of the range (in dollars per share) |
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$ 16.10us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeAndDirectorMember
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| 2011 Plan | Employees and directors | Minimum |
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| Stock-based compensation |
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| Vesting period |
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2 years
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| 2011 Plan | Employees and directors | Maximum |
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| Stock-based compensation |
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| Vesting period |
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3 years
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| Outside 2011 Plan | Certain Key Employees and Consultants |
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| Stock-based compensation |
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| Term of stock options |
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10 years
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| Exercise price, low end of the range (in dollars per share) |
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$ 9.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Outside2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= oncs_CertainKeyEmployeeAndConsultantMember
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| Exercise price, high end of the range (in dollars per share) |
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$ 16.10us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Outside2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= oncs_CertainKeyEmployeeAndConsultantMember
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| Outside 2011 Plan | Certain Key Employees and Consultants | Minimum |
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| Stock-based compensation |
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| Vesting period |
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2 years
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| Outside 2011 Plan | Certain Key Employees and Consultants | Maximum |
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| Stock-based compensation |
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| Options granted to purchase shares |
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200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= oncs_Outside2011PlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= oncs_CertainKeyEmployeeAndConsultantMember
|
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| Vesting period |
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3 years
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