Consolidated Statements of Stockholders' (Deficit) Equity (Parenthetical) - Additional Paid-in Capital - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
At-The-Market Sale Agreement
Issuance of common stock, issuance costs		$ 157
Private Placement
Issuance of common stock, issuance costs	$ 1,600

Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

Reference 1: 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=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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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