Common Stock Warrants and Common Stock Warrant Liability (Tables)

6 Months Ended

Jun. 30, 2020

Warrants and Rights Note Disclosure [Abstract]

Schedule of common stock warrant activity

The table summarizes the common stock warrant activity as of June 30, 2020 as follows:

						Balance									Balance										Balance
Issue Date	Warrant Type	Term Date	Exercise Price			December 31, 2018		Issued		Exercised			Expired		December 31, 2019		Issued		Exercised			Expired			June 30, 2020
2016 and prior	Various	Various-2020/2021		Various			17,059		-		-			-		17,059		-		(9,375	)		(750	)		6,934
November 21, 2017	Common Stock Offering Warrants	November 21, 2022	$	2.1122	(1)		159,092		-		(15,591	)		-		143,501		-					-			143,501
November 21, 2017	Dealer Manager Warrants	November 21, 2022	$	30.00			47,250		-		-			-		47,250		-		(47,250	)		-			-
June 20, 2018	Warrant Reissue	December 20, 2023	$	36.40			56,696		-		-			-		56,696		-		-			-			56,696
August 13, 2018	Rights Offering Warrants	July 25, 2023	$	23.00			267,853		-		(64,910	)		-		202,943		-		-			-			202,943
August 13, 2018	Dealer Manager Warrants	August 13, 2023	$	34.50			13,393		-		-			-		13,393		-		-			-			13,393
July 16, 2019	Dealer Manager Warrants	July 11, 2024	$	33.75			-		8,334		-			-		8,334		-		-			-			8,334
January 28, 2020	Registered Direct Offering	July 28, 2025	$	9.00			-		-		-			-		-		177,500		-			-			177,500
January 28, 2020	Dealer Manager Warrants	July 28, 2025	$	10.00			-		-		-			-		-		13,315		-			-			13,315
March 6, 2020	Registered Direct Offering	September 8, 2025	$	2.88			-		-		-			-		-		176,372		-			-			176,372
March 6, 2020	Dealer Manager Warrants	March 4, 2025	$	3.76			-		-		-			-		-		13,228		-			-			13,228
April 21, 2020	Dealer Manager Warrants	April 21, 2025	$	3.97			-		-		-			-		-		118,073		-			-			118,073
April 24, 2020	Registered Direct Offering	April 24, 2025	$	3.05			-		-		-			-		-		1,574,308		-			-			1,574,308
							561,343									489,176										2,504,597

(1) Pursuant to antidilution price adjustment protection contained within these warrants, the initial exercise price of these warrants was $30.00 per share, which adjusted downward to $29.40 on July 24, 2018, the record date of the Right's Offering, downward to $19.00 per share on August 13, 2018, the date of the Rights Offering, downward to $7.13 per share on January 28, 2020, the date of a Registered Direct Offering and downward to $2.1122 per share on March 6, 2020, the date of a Registered Direct Offering.