Stockholders' Equity - Equity Issuances (Details) - USD ($)	1 Months Ended	3 Months Ended
	Feb. 28, 2018	Mar. 31, 2019	Aug. 31, 2018
H.C. Wainwright Sales Agreement [Member]
Class of Stock [Line Items]
Stock issued (shares)		149,041
Proceeds from issuance of stock		$ 1,000,000
Aggregate offering amount authorized per agreement	$ 12,000,000
Maximum number of shares authorized per agreement	2,790,697		4,921,260
Commission on gross proceeds due to third party (percent)	3.00%
H.C. Wainwright Sales Amended Agreement [Member]
Class of Stock [Line Items]
Aggregate offering amount authorized per agreement			$ 25,000,000