Consolidated Statements of Changes in Equity (Parentheticals) - USD ($) $ in Thousands		12 Months Ended
Jan. 17, 2018	Dec. 31, 2018
Investor Warrants [Member] \| Private Placement [Member]
Proceeds allocated to warrant liabilities		$ 1,890
Investor Warrants [Member]
Proceeds allocated to warrant liabilities	$ 1,890	503
Placement Agent Warrants [Member] \| Private Placement [Member]
Proceeds allocated to warrant liabilities		390
Placement Agent Warrants [Member]
Proceeds allocated to warrant liabilities	385	103
Private Placement [Member]
Direct offering costs	1,200	1,200
Proceeds allocated to warrant liabilities	$ 2,275	$ 606

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

Name:	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration