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Stock-Based Compensation (Details) (USD $)
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3 Months Ended |
6 Months Ended |
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Jan. 31, 2015
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Jan. 31, 2014
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Jan. 31, 2015
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Jan. 31, 2014
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| Stock-based compensation |
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| Expected volatility, minimum (as a percent) |
90.35%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
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91.99%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
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88.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
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83.62%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
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| Expected volatility, maximum (as a percent) |
91.86%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
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92.62%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
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93.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
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92.52%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
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| Risk-free interest rate, minimum (as a percent) |
1.31%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
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1.67%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
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0.36%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
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0.69%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
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| Risk-free interest rate, maximum (as a percent) |
1.94%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
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1.87%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
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2.13%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
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1.87%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 |
$ 405,000us-gaap_AllocatedShareBasedCompensationExpense
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$ 221,000us-gaap_AllocatedShareBasedCompensationExpense
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$ 1,017,000us-gaap_AllocatedShareBasedCompensationExpense
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$ 292,000us-gaap_AllocatedShareBasedCompensationExpense
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| Minimum |
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| Stock-based compensation |
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| Expected term |
5 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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6 years
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6 years 6 months
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6 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 |
166,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
|
155,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
|
482,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
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163,000us-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 |
$ 239,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
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$ 66,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
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$ 535,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
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$ 129,000us-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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10 years
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| Options granted to purchase shares |
425,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
|
75,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
|
2,575,000us-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) |
$ 0.39us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
|
$ 0.31us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
|
$ 0.41us-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) |
$ 0.53us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
|
$ 0.54us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_EmployeeMember
|
$ 0.53us-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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2 years
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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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3 years
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| 2011 Plan | Consultant |
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| Stock-based compensation |
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| Options granted to purchase shares |
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500,000us-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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$ 0.39us-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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$ 0.43us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Plan2011Member
/ us-gaap_TitleOfIndividualAxis
= oncs_ConsultantsMember
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| 2011 Plan | Consultant | 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 | Consultant | 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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| Outside 2011 Plan | Officer |
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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) |
|
$ 0.31us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Outside2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
|
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| Exercise price, high end of the range (in dollars per share) |
|
$ 0.54us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_PlanNameAxis
= oncs_Outside2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
|
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| Outside 2011 Plan | Officer | 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 | Officer | Maximum |
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| Stock-based compensation |
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| Options granted to purchase shares |
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1,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= oncs_Outside2011PlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
|
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| Vesting period |
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3 years
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