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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax [Line Items] |  |
Recognized tax expense on remeasurement of certain deferred tax assets and liabiliites |  | $ 1,662,000
U.S. corporate income tax | 21.00% | 34.00%
Recognized provisional tax expense on transition tax for repatriation of foreign earnings |  | $ 565,000
Computation of one-time tax based on liquid asset period |  | 3 years
Tax expense impacted by cash and other liquid assets |  | 15.50%
Tax expense impacted by non-cash E&P |  | 8.00%
Income (loss) before income taxes from domestic operations | $ 972,000 | $ (65,000)
Profit before income taxes from foreign operations | 598,000 | 284,000
Net deferred tax assets | 127,000 | $ 173,000
Research and Development Credit Carryforwards [Member] |  |
Income Tax [Line Items] |  |
Tax credit carryforward amount | $ 1,598,000 |
Research and Development Credit Carryforwards [Member] | Minimum [Member] |  |
Income Tax [Line Items] |  |
Expiration year | 2020 |
Research and Development Credit Carryforwards [Member] | Maximum [Member] |  |
Income Tax [Line Items] |  |
Expiration year | 2038 |
Foreign Tax Credit Carryforward [Member] |  |
Income Tax [Line Items] |  |
Tax credit carryforward amount | $ 368,000 |
Foreign Tax Credit Carryforward [Member] | Minimum [Member] |  |
Income Tax [Line Items] |  |
Expiration year | 2019 |
Foreign Tax Credit Carryforward [Member] | Maximum [Member] |  |
Income Tax [Line Items] |  |
Expiration year | 2020 |
Federal [Member] |  |
Income Tax [Line Items] |  |
Net operating loss carryforwards | $ 9,429,000 |
Expiration year | 2038 |
State [Member] |  |
Income Tax [Line Items] |  |
Net operating loss carryforwards | $ 15,906,000 |
Expiration year | 2038 |

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