Related Party Transactions, Related Party Consultant #1 (Details) - Related Party Consultant 1 [Member] - USD ($)	1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2016	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2016
Related Party Transaction [Abstract]
Finders' fee percentage			4.00%
Finders' fees				$ 46,000	$ 93,400
PPM Price (in dollars per share)		$ 15.33				$ 29.22
Convertible Promissory Note Issued in August 2016 [Member]
Related Party Transaction [Abstract]
Convertible promissory note						$ 200,000
Convertible promissory note plus accrued interest		$ 204,110
Shares issued upon conversion (in shares)		7,761
Share price (in dollars per share)		$ 26.30
Shares issued (in shares)	6,985
Shares Issued in Lieu of Cash Compensation [Member]
Related Party Transaction [Abstract]
Share price (in dollars per share)				$ 15.33	$ 29.22
Shares issued (in shares)	2,876			3,001	3,196