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Assignment, License and Collaboration Agreements - Additional Information (Details) ¥ in Millions		1 Months Ended					3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Nov. 30, 2021 USD ($)	Jul. 31, 2022 USD ($)	Jul. 31, 2020 USD ($)	Jun. 30, 2019 CNY (¥)	Mar. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2022	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
TERN-101 License Agreement with Eli Lilly
Assignment License And Collaboration Agreements [Line Items]
Agreement milestones payment										$ 0
Research and development expense							$ 0	$ 0		0	$ 0
TERN-101 License Agreement with Eli Lilly | China
Assignment License And Collaboration Agreements [Line Items]
Aggregate pre-specified development milestones for the first covered product						$ 6,000,000.0
Aggregate pre-specified development milestones for the first covered product in ex-mainland						$ 50,000,000.0
TERN-201 License Agreement with Eli Lilly
Assignment License And Collaboration Agreements [Line Items]
Aggregate pre-specified development milestones for the first covered product in ex-mainland					$ 74,000,000.0
Agreement milestones payment										0
Research and development expense							0	0		0	$ 0
Aggregate pre-specified development milestones for second indication of covered product					$ 30,000,000.0
Amount paid under the agreement										4,000,000.0
TERN-201 License Agreement with Eli Lilly | Research and Development Expense
Assignment License And Collaboration Agreements [Line Items]
Upfront payment														$ 4,000,000.0
Assignment Agreement
Assignment License And Collaboration Agreements [Line Items]
Aggregate pre-specified development milestones for the first covered product | ¥				¥ 205.0
Research and development expense							0	$ 0		0
Amount paid under the agreement										4,400,000
Number of days advance written notice									60 days
Milestone payment										1,500,000
Assignment Agreement | Research and Development Expense
Assignment License And Collaboration Agreements [Line Items]
Upfront payment													$ 700,000
Hansoh Option and License Agreement
Assignment License And Collaboration Agreements [Line Items]
Upfront payment received												$ 800,000
License revenue	$ 1,000,000.0
Hansoh Option and License Agreement | Maximum
Assignment License And Collaboration Agreements [Line Items]
Amount agree to pay in pre-specified clinical, regulatory and sales milestones			$ 67,000,000.0
Phase 2a DUET
Assignment License And Collaboration Agreements [Line Items]
Research and development expense							$ 2,200,000			$ 2,200,000
Milestone payment		$ 2,200,000

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