Condensed Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)					1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 20, 2018	Aug. 13, 2018	Jan. 30, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Cancelled insurance premiums previously financed through third-parties, remaining principal outstanding balance							$ 31,000
Financed insurance premium through third party financing							488,000	$ 360,000
Fixed assets purchased under capital lease obligations							270,000	363,000
Purchases of fixed assets							$ 55,000	$ 205,000	$ 31,000	$ 58,000
Issuance of unregistered warrants to purchase shares of common stock	762,438	2,549,140	1,095,153	72,000
Exercise price of unregistered warrants		$ 4.53	$ 4.53	$ 75.00
Unregistered warrants to purchase common stock, period				5 years
Issuance of unregistered warrants to purchase shares of common stock, grant date fair value	$ 2,000,000	$ 8,400,000	$ 9,700,000	$ 2,800,000
Offering fees and costs recorded within common stock issuance costs as an offset to additional paid in capital	$ 300,000	$ 1,400,000	$ 1,400,000	$ 728,000
Public offering, number of common stock and warrants issued	642,438		1,095,153
Stock price	$ 3.285		$ 13.50
Class of warrant or rights, term		5 years	5 years
Aggregate units sold under right offering		11,587
Aggregate shares sold under right offering	642,438
Warrant exercisable for share of common stock		1
Gross proceeds from offering	$ 2,500,000	$ 11,600,000
Preferred stock converted to shares of common stock					1,012,622	1,012,622	1,012,622
Deemed dividend related to warrants down round provision					$ 636,000	$ 636,370	$ 636,370
Private Placement [Member]
Exercise price of unregistered warrants	$ 3.16
Class of warrant or rights, term	5 years
Warrant exercisable for share of common stock	1
Prefunded Warrants [Member]
Exercise price of unregistered warrants	$ 3.275
Issuance of warrants to purchase shares of common stock	120,000
Change in exercise price of warrants	$ 0.01
Warrants [Member]
Aggregate warrants sold under right offering		2,549,140
Series A Preferred Stock [Member]
Aggregate shares sold under right offering		11,587
Shares converted						4,582
Maximum [Member]
Issuance of warrants to purchase shares of common stock			1,095,153
Maximum [Member] | Prefunded Warrants [Member]
Issuance of warrants to purchase shares of common stock	120,000