Common Shares Reserved for Issuance - Narrative (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2020 vote $ / shares shares	Dec. 31, 2019 vote $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized (shares)	1,000,000,000	1,000,000,000
Common stock, par value (usd per share) | $ / shares	$ 0.0001	$ 0.0001
Voting right per common share | vote	1	1
Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock authorized (shares)	100,000,000	100,000,000
Preferred stock, par value (usd per share) | $ / shares	$ 0.0001	$ 0.0001
Preferred stock, shares issued (shares)	0	0
Preferred stock, outstanding (shares)	0	0