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Milestone payments eligible to receive.

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Upfront amount allocated to equity arrangements.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Collaboration Agreement and Stock Purchase Agreement with BMS - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 31, 2019	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Preferred stock, shares issued		0		0
Deferred revenue current		$ 16,749		$ 17,100
Deferred revenue non-current		4,645		$ 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 \| 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		3,400	$ 3,500
Deferred revenue		21,400
Deferred revenue current		16,700
Deferred revenue non-current		$ 4,600
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