Stockholders’ Deficit (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders Equity Note [Abstract]

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

As of December 31, 2018 and 2017, the Company had reserved common stock, on an if-converted basis, for issuance as follows:    

	December 31, 2018		December 31, 2017
Common stock options issued and outstanding		1,458,080		544,116
Convertible preferred stock		—		30,459,574
Remaining shares available for issuance under 2015    & 2018 Stock Plan		3,801,191		1,855,240
Total		5,259,271		32,858,930