Common Stock (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Schedule of Shares Reserved for Future Issuance

Shares reserved for future issuance

	As of September 30, 2020		As of December 31, 2019
Conversion of redeemable convertible preferred stock		—		18,442,233
Exercises of outstanding stock option awards		2,808,477		1,337,501
Shares of common stock available for future grants    under the 2015 Equity Incentive Plan, as amended		—		567,110
Shares of common stock available for future grants    under the 2020 Equity Incentive Plan		3,907,999		—
Shares of common stock available for future issuance    under the 2020 ESPP		700,000		—
Total shares reserved for future issuance		7,416,476		20,346,844