Related Party Transactions (Details)		12 Months Ended
	Oct. 07, 2018 USD ($) agreement installment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2020 USD ($)	Jul. 15, 2019 USD ($)	Apr. 15, 2019 USD ($)	Jan. 15, 2019 USD ($)	Oct. 15, 2018 USD ($)
Related Party Transaction [Line Items]
Number of additional agreements | agreement	3
Related party transactions, accrued reimbursement of IP expenses and sublicense royalty fees				$ 100,000
Master services and IP agreements
Related Party Transaction [Line Items]
Payments to acquire assets			$ 1,100,000
Milestone payments				$ 0
Executive vice president and chief scientific officer
Related Party Transaction [Line Items]
Total amount due	$ 1,000,000.0				$ 250,000	$ 250,000	$ 250,000	$ 250,000
Number of quarterly installment payments | installment	4
Installment paid		$ 1,000,000.0
Related party transactions, accrued reimbursement of legal expenses		$ 100,000