Sponsored Research, Collaboration and License Agreements - Additional Information (Details)	1 Months Ended			12 Months Ended
	Nov. 30, 2020 USD ($)	May 31, 2020 USD ($)	Jun. 30, 2019 USD ($) Installment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Sponsored Research, Collaboration and License Agreements [Line Items]
Research and development expense				$ 49,663,000	$ 16,248,000
A&R License Agreement | BCM
Sponsored Research, Collaboration and License Agreements [Line Items]
Non-refundable license fee payments		$ 250,000
Milestone payments				$ 40,000,000
Minimum percentage of eligible to receive tiered royalties				1.00%
Second License Agreement | BCM
Sponsored Research, Collaboration and License Agreements [Line Items]
Non-refundable license fee payments	$ 125,000
Milestone payments				$ 30,000,000
Minimum percentage of eligible to receive tiered royalties				1.00%
Non-refundable license fee payments, first year through fourth anniversary of effective date				$ 20,000
Non-refundable license fee payments fifth anniversary of effective date and continuing thereafter				40,000
SRA-2 | BCM
Sponsored Research, Collaboration and License Agreements [Line Items]
Agreement for research activities, term			1 year
Agreement for research activities, additional term with written consent			1 year
Research activities performing fees			$ 1,000,000
Number of installment for research activities payments | Installment			4
Research Agreement | BCM
Sponsored Research, Collaboration and License Agreements [Line Items]
Agreement for research activities, term	3 years
Research activities performing fees	$ 2,000,000
Total research activities performing fees, over the term	$ 6,000,000
Collective Agreements | BCM
Sponsored Research, Collaboration and License Agreements [Line Items]
Research and development expense				$ 1,100,000	$ 900,000