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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy for Financial Assets (Cash Equivalents and Investments) (Details) - Fair Value, Measurements, Recurring - Money market funds - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair value hierarchy for its financial assets
Available-for-sale Securities	$ 628	$ 621
Level 1
Fair value hierarchy for its financial assets
Available-for-sale Securities	$ 628	$ 621

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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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

No definition available.

+ Details

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- Details

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- Details

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