Equity, Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended	14 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2016	Aug. 31, 2015
Universal Shelf Registration Statement [Member]
Common Stock [Abstract]
Securities offered for sale, aggregate value				$ 100,000
ATM Agreement [Member]
Common Stock [Abstract]
Securities offered for sale, aggregate value				$ 35,000
Average sales price per common share (in dollars per share)	$ 4.05	$ 4.56	$ 4.46
Aggregate proceeds from sales of common stock	$ 910	$ 15,079	$ 18,456
ATM Agreement [Member] | Common Stock [Member]
Common Stock [Abstract]
Number of shares of common stock sold (in shares)	224,944	3,304,873	4,139,929
Sales commissions, fees and other costs associated with issuance of common stock	$ 27	$ 452	$ 554