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Assignment, License and Collaboration Agreements - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jul. 31, 2020 USD ($) | Jun. 30, 2019 CNY (¥) | Mar. 31, 2018 USD ($) | Feb. 28, 2018 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 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 |  |  |
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 |  |  | $ 74,000,000.0 |  |  |  |  |  |
Agreement milestones payment |  |  |  |  | 0 |  |  |  |
Research and development expense |  |  |  |  | 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 | ¥ |  | ¥ 205,000,000.0 |  |  |  |  |  |  |
Research and development expense |  |  |  |  | 0 | $ 0 |  |  |
Amount paid under the agreement |  |  |  |  | $ 2,200,000 |  |  |  |
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] |  |  |  |  |  |  |  |  |
Refundable and non-creditable upfront payment | $ 1,000,000.0 |  |  |  |  |  |  |  |
Upfront payment refund period from expiration or termination of option | 6 months |  |  |  |  |  |  |  |
Percentage of interest rate on refund amount | 5.00% |  |  |  |  |  |  |  |
Upfront payment received |  |  |  |  |  |  | $ 800,000 |  |
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 |  |  |  |  |  |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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