Convertible Notes - Estimated Fair Value (Details) - Compounded Bifurcated Derivatives - Binomial Lattice Model - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Calculated aggregate value	$ 3,136	$ 1,735
Closing price per share of common stock (usd per share)	$ 0.64	$ 1.89
Contractual remaining term	8 years 8 months	9 years 8 months
Contractual interest rate	4.00%	4.00%
Volume-weighted average conversion rate (in usd per share)	$ 3.40933	$ 3.40985
Dividend yield	0.00%	0.00%
Credit Spread	36.98%	33.27%
Volatility	99.00%	99.90%
Minimum
Debt Instrument [Line Items]
Risk-free interest rate	1.28%	0.44%
Maximum
Debt Instrument [Line Items]
Risk-free interest rate	2.40%	2.45%

Closing price per share of common stock.

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- Definition

Fair Value Assumptions, Volume-weighted Average Conversion Rate

+ References

No definition available.

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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

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
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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
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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

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- Definition

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

+ References

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- Definition

Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

+ References

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