Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Private Placement [Member] \| Investor Warrants [Member]
Proceeds allocated to warrant liabilities	$ 1,890
Private Placement [Member] \| Placement Agent Warrants [Member]
Proceeds allocated to warrant liabilities	390
Private Placement [Member]
Direct offering costs	1,200
Investor Warrants [Member]
Proceeds allocated to warrant liabilities	664
Placement Agent Warrants [Member]
Proceeds allocated to warrant liabilities	137
Proceeds allocated to warrant liabilities	$ 801

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration