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

12 Months Ended

Dec. 31, 2019

Stockholders Equity Note [Abstract]

Schedule of Reserved Common Stock on an if-Converted Basis for Issuance

As of December 31, 2019 and 2018, the Company had reserved common stock, on an if-converted basis, for issuance as follows:

	As of December 31,
	2019		2018
Common stock options issued and outstanding		4,738,004		1,458,080
Remaining shares available for issuance under 2015    & 2018 Stock Plan		2,315,099		3,801,191
Unvested restricted stock issued as part of    collaboration agreement		1,257,651		-
Total		8,310,754		5,259,271