Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of outstanding potentially dilutive securities calculation of diluted loss per share attributable to common stockholders

The following table sets forth the outstanding potentially dilutive securities that have been excluded in the calculation of diluted loss per share attributable to common stockholders (in common stock equivalent shares):

	December 31,
	2018		2017
Common stock purchase warrants		11,226,821		6,431,785
Restricted stock unit		136,245		287,885
Common stock options		1,721,771		1,651,800
Total		12,084,837		8,371,470