Warrants - Aggregate Fair Values, Inputs and Assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Fair value assumptions
Dividend yield	0.00%
Warrant
Fair value assumptions
Calculated aggregate value	$ 838	$ 1,073
Weighted average exercise price per share (usd per share)	$ 6.02	$ 6.02
Closing price per share of common stock (usd per share)	$ 0.59	$ 0.64
Volatility	93.00%	92.20%
Weighted average remaining expected life	3 years 1 month	3 years 4 months
Interest rate (as a percent)	2.34%	2.00%
Dividend yield	0.00%	0.00%

Closing price per share of common stock.

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- Definition

It represents aggregate fair value of warrants.

+ References

No definition available.

+ Details

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- Definition

Exercise price of the warrants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column A

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

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