Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders Equity Note [Abstract]

Summary of Common Stock Shares Reserved for Future Issuance

Common shares reserved for future issuance upon the exercise, issuance or conversion of the respective equity instruments are as follows (in thousands):

	December 31,
	2019		2018
Exercise of common stock options outstanding		7,148		7,811
Shares reserved for issuance under equity incentive plans		3,762		2,785
Vesting of restricted stock units		542		—
Shares reserved for issuance under employee stock purchase plans		848		500
Total		12,300		11,096