Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Schedule of Shares of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance are as follows:

	December 31,
	2021		2020
Common stock options issued and outstanding		11,707,568		9,842,744
Pre-funded warrants to purchase common stock		11,111,110		4,000,000
Common stock reserved and available for future grant under the 2014 Equity Incentive Plan		1,500,062		2,553,854
Common stock reserved for issuance under ESPP		2,914,710		2,301,704
Unvested restricted stock units		1,650,250		—
Total common stock reserved for future issuance		28,883,700		18,698,302