Stockholders' Equity

9 Months Ended

Sep. 30, 2019

Stockholders' Equity [Abstract]

Stockholders' Equity

8. Stockholders’ Equity

Warrants

At September 30, 2019, outstanding warrants to purchase shares of common stock are as follows:

Shares Underlying
Outstanding	Exercise		Expiration
Warrants	Price		Date
2,980	$	1,505.00	March 16, 2020
2,246	$	567.00	March 31, 2021
597,881	$	21.00	May 10, 2022
1,249,955	$	5.60	October 16, 2023
1,200	$	1,680.00	None
1,854,262