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Income Taxes (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2016 | Sep. 30, 2015 | Jan. 31, 2012 | Oct. 31, 2010 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2025 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits |  |  |  |  | $ 834,000 |  | $ 834,000 |  |  |  | $ 911,000
Income Tax Examination, Penalties and Interest Accrued |  |  |  |  | 400,000 |  | 400,000 |  |  |  | $ 400,000
Tax Adjustments, Settlements, and Unusual Provisions |  |  | $ 332,000 | $ 317,000 |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | $ 469,000 | $ 268,000 | $ 1,502,000 | $ 807,000 |  |  |
Subsidiary Revenue |  | $ 65,000,000 |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  |  |  |  | 35.00%
Reversal of Service Tax Refund | $ 160,000 |  |  |  |  |  |  |  |  |  |
Service Tax Credit Receivable | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Maximum cumulative exposure for unrepatriated foreign earnings |  |  |  |  |  |  |  |  |  |  | $ 25,800,000
IncomeTaxReconciliationRepatriationOfForeignEarnings |  |  |  |  |  |  |  |  |  |  | $ 9,100,000
Global Intangible Low-Taxed Income [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  | 10.50% |  |  |  |
Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  |  |  | 21.00% |
Scenario, Plan [Member] | Global Intangible Low-Taxed Income [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  |  | 13.125% |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage for Subsidiary Service Tax |  | 15.00% |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage for Subsidiary Service Tax |  | 12.36% |  |  |  |  |  |  |  |  |
Philippine Bureau Of Taxation [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  | $ 184,000 |  |  |  |

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