Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Outstanding Shares of Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share

The following shares of common stock equivalents were excluded from the calculation of diluted net loss per share for the periods presented because including them would have been antidilutive:

	As of December 31,
	2021		2020		2019
Series A warrants for common stock		7,790,879		7,802,241		7,802,241
Series B warrants for common stock		2,524,732		2,574,727		2,574,727
Options to purchase common stock		4,937,189		4,146,928		326,023
Warrants for common stock		727,122		727,122		1,839
Total potential dilutive shares		15,979,922		15,251,018		10,704,830