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Equity, Common Stock (Details) - Common Stock [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 08, 2018	Aug. 21, 2015	Aug. 20, 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		$ 50,000		$ 35,000
Number of shares of common stock sold (in shares)	1,751,689
Average sales price per common share (in dollars per share)	$ 4.02
Aggregate proceeds from sales of common stock	$ 7,042
Sales commissions, fees and other costs associated with issuance of common stock	$ 212

X

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

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- Definition

Average price of a single share of common stock issued during the period.

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- Definition

Cost associated with sale of common stock.

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