Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of contractual obligation due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_ContractualObligationDueInFourthYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of contractual obligation due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of contractual obligation due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_ContractualObligationDueInThirdYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

Name:	us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of contractual obligation maturing in the remainder of the fiscal year following the latest fiscal year ended.

No definition available.

Name:	us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The total amount of milestone payments that is to be made under license agreement.

No definition available.

Name:	xxii_AggregateMilestonePaymentsToBeMade
Namespace Prefix:	xxii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of contractual obligation due after the fourth fiscal year following the latest fiscal year.

No definition available.

Name:	xxii_ContractualObligationDueAfterFourthYear
Namespace Prefix:	xxii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Milestone payment upon approval of a product.

No definition available.

Name:	xxii_MilestonePayment
Namespace Prefix:	xxii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The period of the agreement.

No definition available.

Name:	xxii_PeriodOfAgreement
Namespace Prefix:	xxii_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The period of time for which the agreement may be extended.

No definition available.

Name:	xxii_PeriodOfAgreementExtension
Namespace Prefix:	xxii_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_TypeOfArrangementAxis=xxii_FrameworkCollaborativeResearchAgreementWithKeygeneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TypeOfArrangementAxis=xxii_LicenseAgreementWithNorthCarolinaStateUniversityAgreement1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TypeOfArrangementAxis=xxii_LicenseAgreementWithNorthCarolinaStateUniversityAgreement2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TypeOfArrangementAxis=xxii_LicenseAgreementWithNorthCarolinaStateUniversityAgreement3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TypeOfArrangementAxis=xxii_SublicenseAgreementWithAnandiaLaboratoriesInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: