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Income Taxes - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 21.00% |  |
Unrecognized Tax Benefits |  |  | $ 2,754,000 |  | $ 2,754,000 |  | $ 2,424,000
Income Tax Examination, Penalties and Interest Accrued |  |  | 100,000 |  | 100,000 |  |
Subsidiary Revenue |  | $ 66,000,000 |  |  |  |  |
Reversal of Service Tax Refund | $ 160,000 |  |  |  |  |  |
Service Tax Credit Receivable | $ 1,000,000 |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  | 421,000 | $ 469,000 | 493,000 | $ 1,502,000 |
Income Tax Examination, Increase (Decrease) in Liability from Prior Year |  |  | $ 200,000 |  | $ 200,000 |  |
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% |  |  |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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