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Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Convertible Debt
Debt Instrument [Line Items]
Contractual interest expense	$ 1,446	$ 1,650
Amortization of debt discount	1,956	2,217
Amortization of debt issuance costs	114	131
Total interest expense	3,516	$ 3,998
Term Loan | Secured Debt
Debt Instrument [Line Items]
Contractual interest expense	1,094
Amortization of debt discount	333
Amortization of debt issuance costs	40
Total interest expense	$ 1,467

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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-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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- Definition

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

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-Publisher FASB
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-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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