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Debt - Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	$ 6,310	$ 6,600
Amortization of debt discount	8,542	7,920
Amortization of debt issuance costs	502	527
Total interest expense	15,354	$ 15,047
Term Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Contractual interest expense	1,511
Amortization of debt discount	472
Amortization of debt issuance costs	57
Total interest expense	$ 2,040

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Amount of amortization expense attributable to debt issuance costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

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-Publisher FASB
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