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Debt - Components (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Net carrying amount	$ 152,625
Convertible Debt
Debt Instrument [Line Items]
Principal	105,125	$ 105,125
Less: unamortized debt discount and debt issuance costs	(12,071)	(20,352)
Net carrying amount	93,054	84,773
Equity component	41,905	41,905
Term Loan [Member] | Secured Debt
Debt Instrument [Line Items]
Principal	47,500	48,000
Less: unamortized debt discount and debt issuance costs	(2,454)	(3,945)
Net carrying amount	$ 45,046	$ 44,055

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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-Publisher FASB
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-Topic 470
-SubTopic 20
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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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-Publisher FASB
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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.

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No definition available.

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Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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