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Debt - Debt Obligation for Borrowings (Details) - Line of credit - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt principal	$ 25,000	$ 25,000
End-of-term debt obligation	283	53
Unamortized debt issuance costs	(91)	(115)
Net debt obligation	$ 25,192	$ 24,938

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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X

- 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.

+ Details

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X

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

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X

- 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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X

- Definition

Represents the amount of interest end of term payment of debt.

+ References

No definition available.

+ Details

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