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Income Taxes - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  | $ 7,917,000 | $ 6,521,000 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | 1,400,000 | 1,800,000 |
Unremitted Earnings of Foreign Subsidiaries |  |  | 47,000,000 |  |
Income Tax Expense (Benefit) |  |  | 401,000 | 1,091,000 |
Unrecognized Tax Benefits |  |  | 3,231,000 | $ 2,957,000 | $ 2,424,000
Subsidiary Revenue |  | $ 64,000,000 |  |  |
Reversal of Service Tax Refund | $ 160,000 |  |  |  |
Service Tax Credit Receivable | $ 1,000,000 |  |  |  |
Canadian Subsidiaries [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  |  | 16,100,000 |  |
Domestic Tax Authority [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  |  | $ 15,500,000 |  |
Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Percentage for Subsidiary Service Tax |  | 15.00% |  |  |
Minimum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Percentage for Subsidiary Service Tax |  | 12.36% |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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