Warrants (Tables)

6 Months Ended

Jun. 30, 2019

Warrants [Abstract]

Outstanding Common Stock Warrants

Outstanding common stock warrants at June 30, 2019 consist of the following:

Issue Date	Expiration Date	Total Warrants		Exercise Price
July 24, 2014	July 24, 2019		1,239,769	$	3.75 - $ 12.25
June 22, 2015	June 22, 2020		600,000	$	3.75
December 30, 2015	December 30, 2020		130,089	$	5.65
January 29, 2016	January 29, 2021		19,812	$	5.30
			1,989,670