Stockholders' Equity (Details Narrative) - USD ($)													1 Months Ended		3 Months Ended	6 Months Ended		12 Months Ended	65 Months Ended
	Oct. 27, 2018	Oct. 27, 2017	Oct. 27, 2017	Oct. 04, 2017	Jul. 06, 2017	Jun. 09, 2017	May 26, 2017	May 16, 2017	Feb. 14, 2017	Oct. 02, 2015	May 27, 2015	Feb. 01, 2013	Jan. 31, 2018	Sep. 30, 2015	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Jun. 30, 2018	Jun. 26, 2017	Jun. 30, 2016	Jan. 15, 2014	Feb. 22, 2013
Shelf registration statement amount														$ 75,000,000
Common stock, shares authorized															112,500,000	112,500,000		112,500,000	112,500,000
Preferred stock, shares authorized															100,000	100,000		100,000	100,000		100,000
Aggregate of common and preferred stock, shares authorized																					112,600,000
Reverse stock split							14-for-1 reverse stock split
Stock issued during period split stock							14	56,982,418
Stock issued during period reverse stock split							14	4,070,172
Share-based compensation arrangement by share-based payment award, options, outstanding, number, ending balance								200,000
Class of warrant or right, outstanding								2,400,000
Common stock, par or stated value per share															$ 0.01	$ 0.01		$ 0.01	$ 0.01
Class of warrant or right, number of securities called by warrants or rights																				506,627
Class of warrant or right, exercise price of warrants or rights																				$ 1.65
Proceeds from warrant exercises																	$ 4,915,286
Offering price, description																(i) the sale of ATM Shares under the ATM Agreement having an aggregate offering price of $25 million or (ii) the termination of the ATM Agreement by Cantor or the Company. The ATM Agreement may be terminated by Cantor or the Company at any time upon 10 days' notice to the other party, or by Cantor at any time in certain circumstances, including the occurrence of a material adverse change in the Company.
Aggregate offering price, additions																$ 12,200,000
2013 Warrants, 2014 Warrants, and June 2016 Warrants [Member]
Proceeds from warrant exercises						$ 2,100,000
Increase (decrease) in fair value of warrants						$ 200,000
2015 Warrants [Member]
Proceeds from warrant exercises											$ 800,000
Increase (decrease) in fair value of warrants											100,000
June 2016 Warrants [Member]
Proceeds from warrant exercises											$ 800,000
July 2017 Direct Offering [Member]
Stock issued during period, shares, new issues					2,050,000
Class of warrant or right, number of securities called by each warrant or right				4,665,000
Share price					$ 2.07
Proceeds from issuance of common stock, gross					$ 4,243,500
Proceeds from issuance of warrants				$ 16,600,000
July 2017 Direct Offering [Member] | Pre-Funded Series CCC Warrants [Member]
Class of warrant or right, number of securities called by warrants or rights					385,000
Class of warrant or right, offered price of warrants or rights					$ 2.06
Beneficial ownership percentage threshold					9.99%
Proceeds from issuance of warrants					$ 793,100
Class of warrant or right, exercise price of warrants or rights					$ 0.01
Class of warrant or right, exercised during period															385,000
July 2017 Direct Offering [Member] | Series AAA Warrants [Member]
Class of warrant or right, number of securities called by warrants or rights					2,435,000
Class of warrant or right, exercise price of warrants or rights				$ 2.07	$ 2.07
July 2017 Direct Offering [Member] | Series BBB Warrants [Member]
Class of warrant or right, number of securities called by warrants or rights					2,435,000
Class of warrant or right, exercise price of warrants or rights				$ 4.75	$ 4.75
July 2017 Direct Offering [Member] | Series DDD Warrants [Member]
Class of warrant or right, number of securities called by warrants or rights				1,166,250
Class of warrant or right, number of securities called by each warrant or right				1
Class of warrant or right, exercise price of warrants or rights				$ 6.20
February 14, 2017 Public Offering [Member]
Stock issued during period, shares, new issues									1,384,704
Shares issued, price per share									$ 3.22
Maximum beneficial ownership of the purchaser									9.99%
Proceeds from issuance of common stock									$ 5,000,000
February 14, 2017 Public Offering [Member] | Series AA Warrant [Member]
Class of warrant or right, number of securities called by warrants or rights									1,177,790
Class of warrant or right, exercise price of warrants or rights									$ 3.22
Class of warrant or right, term									5 years
Stock issued during period, shares, exercise of warrants																		747,254
Proceeds from warrant exercises																		$ 2,400,000
February 14, 2017 Public Offering [Member] | Pre-Funded Series BB Warrant [Member]
Class of warrant or right, number of securities called by warrants or rights									185,713
Class of warrant or right, exercise price of warrants or rights									$ 0.14
Shares issued, price per share									$ 3.08
Stock issued during period, shares, exercise of warrants																		185,713
May 2015 Common Stock Offering [Member] | 2015 Warrants [Member]
Class of warrant or right, number of securities called by warrants or rights											139,284
Class of warrant or right, exercise price of warrants or rights											$ 36.40
ATM Agreement [Member]
Stock issued during period, shares, new issues													457,070						1,784,396
Proceeds from issuance of common stock													$ 1,300,000						$ 12,800,000
Aggregate offering price, additions										$ 17,500,000
Aggregate offering price, remaining amount													$ 12,200,000
Underwriting Agreement [Member] | Oppenheimer & Co. Inc. [Member]
Stock issued during period, shares, new issues		2,640,000
Common stock, par or stated value per share		$ 0.01	$ 0.01
Class of warrant or right, number of securities called by warrants or rights		1,320,000	1,320,000
Warrant, description		Each share of Common Stock is being sold together with 0.5 warrants (the “Investor Warrants”), each whole Investor Warrant being exercisable for one share of Common Stock, at an offering price of $2.50 per share and related Investor Warrants.
Warrant [Member]
Share-based compensation arrangement by share-based payment award, options, outstanding, number, ending balance								2,400,000
Class of warrant or right, outstanding								33,500,000
Class of warrant or right, number of securities called by each warrant or right		2.325	2.325
Class of warrant or right, offered price of warrants or rights		$ 3.00	$ 3.00
Warrants issued, expiration period	5 years
Investor Warrants [Member] | October 2017 Underwritten Offering [Member]
Class of warrant or right, number of securities called by warrants or rights		66,000	66,000
Class of warrant or right, number of securities called by each warrant or right		2.87	2.87
Warrants issued, expiration period			5 years
Proceeds from issuance of common stock and warrants			$ 6,600,000
Investor Warrants [Member] | Underwriting Agreement [Member] | Oppenheimer & Co. Inc. [Member]
Class of warrant or right, number of securities called by each warrant or right		2.50	2.50
Minimum [Member]
Common stock, shares authorized																					75,000,000
Maximum [Member]
Common stock, shares authorized																					112,500,000
Maximum [Member] | ATM Agreement [Member]
Aggregate offering price												$ 25,000,000
Commission on proceeds from atm shares percent												3.00%
Legal fees												$ 50,000
Maximum [Member] | Warrant [Member]
Class of warrant or right, number of securities called by warrants or rights						790,410																64,348	95,811
Class of warrant or right, exercise price of warrants or rights						$ 2.70																$ 57.40	$ 74.34