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Collaboration Agreement and Stock Purchase Agreement with BMS - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2019 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Preferred stock, shares issued |  | 0 |  | 0 |  | 0
Research and development revenue under collaboration agreement |  | $ 382 | $ 3,549 | $ 3,766 | $ 7,023 |
Deferred revenue current |  | 17,194 |  | 17,194 |  | $ 17,100
Deferred revenue non-current |  | 3,819 |  | 3,819 |  | $ 7,678
Stock Purchase Agreement with BMS | Series A-1 Preferred Stock |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Preferred stock, shares issued | 14,545,450 |  |  |  |  |
BMS Collaboration Agreement and Stock Purchase Agreement | IK-175 and IK-412 |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Research and development revenue under collaboration agreement |  | 400 |  |  |  |
BMS Collaboration Agreement and Stock Purchase Agreement | BMS |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Upfront consideration payment | $ 95,000 |  |  |  |  |
Option to exercise additional consideration if clinical trial not completed within research term | 250 |  |  |  |  |
Milestone payments eligible to receive | 450,000 |  |  |  |  |
BMS Collaboration Agreement and Stock Purchase Agreement | BMS | IK-175 |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Amount eligible to receive in case of exercise of options | 50,000 |  |  |  |  |
BMS Collaboration Agreement and Stock Purchase Agreement | BMS | IK-412 |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Amount eligible to receive in case of exercise of options | 40,000 |  |  |  |  |
BMS Collaboration Agreement |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Upfront amount allocated to equity arrangements | 1,800 |  |  |  |  |
Transaction price allocated to revenue arrangement | 78,700 |  |  |  |  |
Revenue recognized which were previously included in deferred revenue |  | 400 | $ 3,500 | 3,800 | $ 7,000 |
Deferred revenue |  | 21,000 |  | 21,000 |  |
Deferred revenue current |  | 17,200 |  | 17,200 |  |
Deferred revenue non-current |  | $ 3,800 |  | $ 3,800 |  |
BMS Collaboration Agreement | IK-175 |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Transaction price allocated to revenue arrangement | 41,200 |  |  |  |  |
BMS Collaboration Agreement | IK-412 |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Transaction price allocated to revenue arrangement | $ 37,500 |  |  |  |  |

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