Net Loss per Common Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Common Stock Excluded from Calculation of Diluted Net Loss Per Share

Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands):

	December 31,
	2021		2020		2019
Options to purchase common stock		8,324		8,637		6,513
Employee stock plan purchases		41		21		19
Employee restricted stock units		716		—		—
Conversion of Series A preferred    stock into shares of common stock		17,157		—		—
Total		26,238		8,658		6,532