Common Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		21 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Sep. 20, 2017
Class of Stock [Line Items]
Proceeds from common stock issued				$ 257
ATM Program [Member]
Class of Stock [Line Items]
Shares issued, price per share		$ 10.40		$ 10.40
Issuance of common stock, shares	0	16,140	0	28,474
Proceeds from common stock issued		$ 168		$ 296
Net proceeds from common stock issue		$ 154		$ 257
ATM Program, Since Inception [Member]
Class of Stock [Line Items]
Shares issued, price per share	$ 10.18		$ 10.18		$ 10.18
Issuance of common stock, shares					197,478
Proceeds from common stock issued					$ 2,011
Net proceeds from common stock issue					$ 1,879
Maximum [Member] | ATM Program [Member]
Class of Stock [Line Items]
Equity distribution agreement, aggregate price of shares available for sale						$ 50,000
Minimum [Member] | ATM Program [Member]
Class of Stock [Line Items]
Public float required to sell shares of common stock						$ 75,000