Concentrations (Details) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended | |
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Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
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Concentration Risk [Line Items] | |||
Cash and cash equivalents | $ 31,731 | $ 48,260 | |
Sales Revenue Segment | Customer Concentration Risk | |||
Concentration Risk [Line Items] | |||
Southwest Airlines, concentration risk, percent | 18.00% | 19.00% | |
Sales Revenue Segment | Customer Concentration Risk | Connectivity | |||
Concentration Risk [Line Items] | |||
Southwest Airlines, concentration risk, percent | 34.00% | 36.00% | |
Accounts Receivable | Customer Concentration Risk | |||
Concentration Risk [Line Items] | |||
Southwest Airlines, concentration risk, percent | 13.00% | 10.00% | |
Foreign Subsidiaries | |||
Concentration Risk [Line Items] | |||
Cash and cash equivalents | $ 20,200 |
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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