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Subsequent Events (Details) - Common Stock [Member] - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended						9 Months Ended
	Nov. 06, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019
Stock Transactions [Abstract]
Number of shares of common stock sold (in shares)		203,754	467,928	560,338	4,083,377	1,320,921	1,751,689
ATM Agreement [Member]
Stock Transactions [Abstract]
Number of shares of common stock sold (in shares)		203,754						1,232,020
Average sales price per common share (in dollars per share)		$ 6.17						$ 5.79
Aggregate proceeds from sales of common stock		$ 1,257						$ 7,131
Sales commissions, fees and other costs associated with issuance of common stock		$ 38						$ 214
Subsequent Event [Member] | ATM Agreement [Member]
Stock Transactions [Abstract]
Number of shares of common stock sold (in shares)	551,795
Average sales price per common share (in dollars per share)	$ 6.09
Aggregate proceeds from sales of common stock	$ 3,360
Sales commissions, fees and other costs associated with issuance of common stock	$ 101

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