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Stockholders' Equity - Additional Information (Details) - USD ($)						3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 29, 2019	Jan. 01, 2019	Oct. 22, 2018	Feb. 06, 2018	Sep. 13, 2016	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 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
Common stock, shares issued						17,645,720		17,645,720		8,645,720
Common stock, shares outstanding						17,645,720		17,645,720		8,645,720
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								$ 4,782,509	$ 192,320
Net proceeds from sale of common stock and warrants								0	$ 10,728,131
Stock-based compensation, tax benefit from compensation expense								$ 0
Stock options, granted						0		0
Stock options, forfeited						720		720
Stock options, outstanding						210,834		210,834
Stock options, expired						0		5
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, grants in period								313,000
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period								0
Share-based compensation arrangement by share-based payment award, equity instruments other than options, forfeited in period								0
Share-based compensation arrangement by share-based payment award, equity instruments other than options, non-vested, outstanding						313,250		313,250
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						84,412		84,412
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		345,828
At the Market Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, value, new issues							$ 192,320
At the Market Offering [Member] \| Sales Agreement [Member] \| Cowen and Company, LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, value, new issues					$ 11,500,000
Proceeds from issuance of common stock, net of issuance costs										$ 600,000
Gross proceeds from sale of common stock										$ 600,000
At the Market Offering [Member] \| Sales Agreement [Member] \| Maximum [Member] \| Cowen and Company, LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate gross proceeds from issuance of common stock					$ 25,000,000
At the Market Offering [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, value, new issues							$ 1,040
Stock issued during period, shares, new issues							104,043
At the Market Offering [Member] \| Common Stock [Member] \| Sales Agreement [Member] \| Cowen and Company, LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues										318,236
February 2018 Public Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues				2,841,152
Shares issued, price per share				$ 3.25
Gross proceeds from sale of common stock and warrants				$ 12,000,000
Net proceeds from sale of common stock and warrants				$ 10,700,000
Sale of stock, description of transaction								Each unit included one share of common stock and one common warrant to purchase 0.5 share of common stock at an exercise price of $3.25 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 0.5 share of common stock at an exercise price of $3.25 per share.
Class of warrant or right, number of securities called by each warrant or right				0.5
Class of warrant or right, exercise price of warrants or rights				$ 3.25
Warrants exercisable period				5 years
February 2018 Public Offering [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				$ 4.0625
Warrants exercisable period				5 years
February 2018 Public Offering [Member] \| Common Stock [Member] \| Placement Agent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock warrants to purchase				184,615
February 2018 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				851,155
Shares issued, price per share				$ 3.24
February 2018 Public Offering [Member] \| Pre-funded Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, exercise price of warrants or rights				$ 0.01
Warrants exercised										851,155
October 2018 Public Offering [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues			2,220,000
Proceeds from issuance of common stock, net of issuance costs			$ 2,800,000
Gross proceeds from sale of common stock			$ 3,200,000
Shares issued, price per share			$ 1.45
March 2019 Public Offering [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues	9,000,000
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	$ 0.60