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Collaboration Agreement and Stock Purchase Agreement with BMS - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Preferred stock, shares issued |  | 0 | 0 | 0
Deferred revenue current |  | $ 17,100 | $ 17,100 | $ 20,622
Deferred revenue non-current |  | 7,678 | 7,678 | 35,141
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 | 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 |  |  | 31,000 | $ 9,200
Deferred revenue |  | 24,800 | 24,800 |
Deferred revenue current |  | 17,100 | 17,100 |
Deferred revenue non-current |  | 7,700 | $ 7,700 |
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 |  |  |
Revenue recognized which were previously included in deferred revenue |  | $ 16,500 |  |

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