Convertible Preferred Stock and Stockholders’ Equity (Deficit) (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders Equity Note [Abstract]

Summary of Early Exercise of Stock Options

A summary of the early exercised shares is as follows:

	Shares
Balance as of December 31, 2018		709,123
Shares vested		(156,490	)
Balance as of June 30, 2019		552,633