Warrants - Aggregate Fair Values, Inputs and Assumptions (Details) - Warrant Liability - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Fair value assumptions
Calculated aggregate value	$ 3,018	$ 8,275
Weighted average exercise price per share (usd per share)	$ 7.20	$ 7.14
Closing price per share of common stock (usd per share)	$ 2.50	$ 4.55
Volatility (as a percent)	93.30%	85.20%
Weighted average remaining expected life	1 year 6 months	1 year 8 months
Interest rate (as a percent)	0.66%	0.98%
Dividend yield	0.00%	0.00%

Closing price per share of common stock.

No definition available.

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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.

+ Details

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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

+ Details

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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

+ Details

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- Definition

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

+ References

+ Details

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- Definition

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

+ References

+ Details

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- Details

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