Fair Value of Financial Instruments and Investments - Additional Information (Detail) $ in Millions	Jun. 30, 2020 USD ($)
Fair Value Disclosures [Abstract]
Carrying amount of long-term debt, net of unamortized deferred financing costs and debt discounts	$ 9.7

Carrying amount of variable-rate long-term debt, net of unamortized debt discounts and deferred financing fees.

No definition available.

Name:	agtc_CarryingAmountOfVariableRateLongTermDebtNetOfUnamortizedDebtDiscountsAndDeferredFinancingFees
Namespace Prefix:	agtc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant