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Stockholders' Equity (Deficit) (Narrative) (Details) - USD ($)	1 Months Ended			3 Months Ended
	Mar. 31, 2020	Mar. 29, 2020	Oct. 28, 2019	Mar. 31, 2020	Mar. 31, 2019	Feb. 11, 2020	Dec. 31, 2019	Jan. 17, 2018	Jan. 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized	50,000,000			50,000,000			50,000,000	50,000,000	200,000,000
Common stock, shares issued	12,468,214			12,468,214			5,582,280
Common stock, shares outstanding	12,468,214			12,468,214			5,582,280
Preferred stock, shares authorized	10,000,000			10,000,000			10,000,000
Preferred stock, shares issued	0			0			0
Preferred stock, shares outstanding	0			0			0
Proceeds from issuance of common stock, net of issuance costs				$ 5,477,432	$ 4,782,509
Net proceeds from sale of common stock and warrants				$ 0
Stock split				Following receipt of approval from stockholders at a special meeting of stockholders held on August 22, 2019, the Company filed an amendment to its Amended and Restated Certificate of Incorporation to effect a reverse stock split of the issued and outstanding shares of common stock, at a ratio of one share for twenty shares. All share amounts and per share prices in this Quarterly Report have been adjusted to reflect the reverse stock split.
Stock options, forfeited				28
Stock options, outstanding	9,396			9,396
Stock options, expired				230
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, forfeited in period				200
Share-based compensation arrangement by share-based payment award, equity instruments other than options, non-vested, outstanding	14,775			14,775
2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized	54,200			54,200
Share-based compensation arrangement by share-based payment award, description				the number of shares that have been authorized for issuance under the 2015 Plan will be automatically increased on the first day of each fiscal year beginning on January 1, 2016 and ending on (and including) January 1, 2025, in an amount equal to the lesser of (1) 4% of the outstanding shares of common stock on the last day of the immediately preceding fiscal year, or (2) another lesser amount determined by the Company’s Board of Directors.
Share-based compensation arrangement by share-based payment award, number of shares available for grant	229,533			229,533
Share-based compensation arrangement by share-based payment award, common stock percentage				4.00%
Share-based compensation arrangement by share-based payment award, number of additional shares added				223,291
H.C. Wainwright & Co., LLC [Member] \| 2020 ATM Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for future issuance amount						$ 15,700,000
Common Stock [Member] \| 2020 ATM Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues				358,452
Proceeds from issuance of common stock, net of issuance costs				$ 942,000
Gross proceeds from sale of common stock				$ 974,000
Common Stock [Member] \| H.C. Wainwright & Co., LLC [Member] \| 2020 ATM Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues				2,814,934
Proceeds from issuance of common stock, net of issuance costs				$ 5,500,000
Gross proceeds from sale of common stock				5,800,000
Remaining availability under market offering				$ 9,900,000
March 2019 Public Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues		450,000
Proceeds from issuance of common stock, net of issuance costs		$ 4,800,000
Gross proceeds from sale of common stock		$ 5,400,000
Shares issued, price per share		$ 12
October 2019 Public Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues			2,590,170
Shares issued, price per share			$ 2.00
Sale of stock, description of transaction			Each unit included one share of common stock and one common warrant to purchase one share of common stock at an exercise price of $2.00 per share. Each pre-funded unit included one pre-funded warrant to purchase one share of common stock for an exercise price of $0.01 per share, and one common warrant to purchase one share of common stock at an exercise price of $2.00 per share.
Class of warrant or right, exercise price of warrants or rights			$ 2.00
Warrants exercisable period			5 years
October 2019 Public Offering [Member] \| Common Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants exercised	4,071,000
October 2019 Public Offering [Member] \| Common Stock [Member] \| Placement Agent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, exercise price of warrants or rights			$ 2.60
Warrants exercisable period			5 years
Issuance of common stock warrants to purchase			235,000
October 2019 Public Offering [Member] \| Pre-funded Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues			2,109,830
Shares issued, price per share			$ 1.99
Gross proceeds from sale of common stock and warrants			$ 9,400,000
Net proceeds from sale of common stock and warrants			$ 8,300,000
Class of warrant or right, exercise price of warrants or rights			$ 0.01
Warrants exercised	2,109,830
October 2019 Public Offering [Member] \| Pre Funded Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants exercised			2,109,830