Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

Potential common shares issuable upon conversion, vesting or exercise of preferred stock, unvested restricted stock, common stock warrants, and stock options that are excluded from the computation of diluted weighted-average shares outstanding are as follows:

	As of June 30,
	2019		2018
Redeemable preferred stock		-		6,966
Common stock warrants		10,386,256		25,211
Common stock options		873,066		53,846
Restricted stock		323,262		639