Equity, Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	16 Months Ended
	Sep. 30, 2017	Dec. 30, 2016	Aug. 21, 2015	Aug. 20, 2015
Universal Shelf Registration Statement [Member]
Common Stock [Abstract]
Securities offered for sale, aggregate value			$ 100,000
Aggregate value of common stock available for offer and sale	$ 65,000
ATM Agreement [Member]
Common Stock [Abstract]
Securities offered for sale, aggregate value				$ 35,000
Average sales price per common share (in dollars per share)		$ 4.14
Aggregate proceeds from sales of common stock		$ 23,169
Aggregate value of common stock available for offer and sale	$ 11,800
ATM Agreement [Member] | Common Stock [Member]
Common Stock [Abstract]
Number of shares of common stock sold (in shares)	0	5,595,650
Sales commissions, fees and other costs associated with issuance of common stock		$ 695