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