Fair Value Measurements - Schedule of Valuation Assumptions used in Determining Fair Value (Details) - Convertible Debt - 5.00% / 7.00% Convertible Notes due August 31, 2022 - Level 3	12 Months Ended
Dec. 31, 2017
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Risk-free interest rate (as a percent)	2.16%
Credit spreads (as a percent)	13.93%
PIK premium spread (as a percent)	2.00%
Volatility (as a percent)	50.00%

Fair Value Inputs, Payment in Kind Spread

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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

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock 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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Risk-free interest rate assumption used in valuing an instrument.

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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.

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