License, Research and Collaboration Agreements - Additional Information (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
ABL Bio Corporation Agreements
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Upfront payment received		$ 5,000,000
ABL Bio Corporation Agreements | Oncology
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Eligible to receive development milestone payments		110,000,000
Eligible to receive commercial milestone payments		295,000,000
ABL Bio Corporation Agreements | Ophthalmology
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Milestone payment and royalties received		$ 185,000,000
Adimab Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Collaboration agreement date		Oct. 16, 2014
Milestone payments		$ 0
Future milestone payments	$ 2,000,000.0	2,000,000.0
FUJIFILM Diosynth Biotechnologies ("Fujifilm") Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Future milestone payments	1,200,000	1,200,000
Prepayments for future work		1,800,000
Total expense to be recognized		3,000,000.0
Cash payment for license agreement	100,000	1,300,000
Research and development	$ 25,000	$ 1,000,000.0