Equity - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended	9 Months Ended
	Jul. 14, 2020	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Jul. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Common stock, shares authorized			250,000,000	250,000,000			57,013,463
Common stock, par value			$ 0.0001	$ 0.0001			$ 0.0001
Proceeds from offering, net of underwriting discounts and other offering costs				$ 205,743,000
Temporary equity, shares outstanding	42,953,085		0	0			32,934,785
Preferred stock issued and sold	42,953,085		0	0			32,934,785
Common stock, voting rights				Each share of common stock is entitled to one vote.
Dividends declared			$ 0	$ 0
Common Stock
Class Of Stock [Line Items]
Number of shares issued and sold			14,000,000
Convertible Preferred Stock
Class Of Stock [Line Items]
Temporary equity, shares outstanding	42,953,085	42,953,085				32,934,785	32,934,785	32,934,785	32,160,719	26,657,769	18,200,011
Warrants to purchase stock	151,042
Convertible Preferred Stock | Common Stock
Class Of Stock [Line Items]
Number of outstanding securities converted	34,445,108
Convertible Preferred Stock | Warrants to Purchase Convertible Preferred Stock (As Converted to Common Stock)
Class Of Stock [Line Items]
Number of outstanding securities converted	121,122
Series D Preferred Stock
Class Of Stock [Line Items]
Temporary equity, shares outstanding	10,018,300
Preferred stock issued and sold	10,018,300	10,018,300
Preferred stock, issued and sold price per share		$ 10.93
Gross proceeds from issuance of convertible preferred stock		$ 109,500,000
IPO
Class Of Stock [Line Items]
Common stock, shares authorized					250,000,000
Common stock, par value					$ 0.0001
Undesignated preferred stock, shares authorized					10,000,000
Undesignated preferred stock, par value					$ 0.0001
Number of shares issued and sold	14,000,000
Public offering price per share	$ 16.00
Proceeds from offering, net of underwriting discounts and other offering costs	$ 205,700,000
IPO | Common Stock
Class Of Stock [Line Items]
Number of outstanding securities converted			34,445,108