Common Stock - Public Offering of Common Stock (Details) - USD ($)			12 Months Ended
	Feb. 05, 2019	Mar. 27, 2018	Dec. 31, 2018	Dec. 31, 2017
Proceeds from the issuance of common stock				$ 10,000,000
Common Stock | Public Offering
Issuance of stock (in shares)		2,146,667	2,146,667
Price per common stock (in dollars per share)		$ 7.50
Proceeds from the issuance of common stock		$ 14,796,000.000
Common Stock | Over-Allotment Option
Issuance of stock (in shares)	985,714	280,000