Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Summary of Shares of Common Stock Reserved for Future Issuance

The Company has reserved for future issuance the following number of shares of common stock:

	As of December 31,
	2021	2020
Options to purchase common stock	7,057,258	6,011,126
Shares available for future grant	783,873	664,544
RSU's issued and expecting to vest	—	1,043,300
2018 Employee Stock Purchase Plan	1,084,476	724,305
Shares available for conversion of note payable	832,677	1,282,052
Shares available for ATM offering	23,176,492	13,003,664
Total reserved	32,934,776	22,728,991