Condensed Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Cancelled insurance premiums previously financed through third-parties, remaining principal outstanding balance			$ 31,000
Financed insurance premium through third party financing			80,000
Fixed assets purchased under capital lease obligations		$ 149,000	79,000
Purchases of fixed assets		86,000	$ 19,000	$ 25,000	$ 31,000
Exercise price of unregistered warrants	$ 1.20
Class of warrant or rights, term	5 years
Issuance of unregistered warrants to purchase shares of common stock, grant date fair value	$ 9,700,000
Offering fees and costs recorded within common stock issuance costs as an offset to additional paid in capital	1,400,000
Deemed dividends related warrants downround provision	$ 99,000	99,743
Operating lease, right-of-use asset		1,635,476
Operating lease liability		1,869,133
Lease right-of-use assets		$ 1,476,804
Follow-on Public Offering [Member]
Public offering, number of common stock and warrants issued	1,095,153
Stock price	$ 13.50
Exercise price of unregistered warrants	$ 1.20
Class of warrant or rights, term	5 years
Issuance of unregistered warrants to purchase shares of common stock, grant date fair value	$ 9,700,000
Proceeds from issuance of common stock, net of issuance costs	$ 13,300,000
Follow-on Public Offering [Member] | Maximum [Member]
Issuance of warrants to purchase shares of common stock	1,095,153