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Income Taxes - Reconciliation of Income tax expense (benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Computed “expected” tax benefit (in Dollars) | $ (93) |  | $ (269) |
Computed “expected” tax benefit (benefit) | 21.00% | 21.00% | 24.30% | 35.00%
Increases (reductions) in taxes resulting from: |  |  |  |
State income taxes, net of federal tax benefit (in Dollars) | $ (73) |  | $ (107) |
State income taxes, net of federal tax benefit | 16.50% |  | 9.70% |
Foreign operations (in Dollars) | $ (46) |  | $ (70) |
Foreign operations | 10.40% |  | 6.30% |
Permanent differences (in Dollars) | $ 31 |  | $ (14) |
Permanent differences | (7.00%) |  | 1.30% |
Change in valuation allowance (in Dollars) | $ 235 |  | $ 118 |
Change in valuation allowance | (53.20%) |  | (10.70%) |
Deferred revenue (in Dollars) | $ (48) |  |  |
Deferred revenue | 10.90% |  |  |
Impact of 965 one-time transition tax (in Dollars) |  |  | $ 771 |
Impact of 965 one-time transition tax |  |  | (69.70%) |
Federal tax rate change (in Dollars) |  |  | $ 588 |
Federal tax rate change |  |  | (53.20%) |
Payable true up (in Dollars) | $ 17 |  |  |
Payable true up | (3.80%) |  |  |
Uncertain tax liability adjustment (in Dollars) | $ (41) |  | $ 11 |
Uncertain tax liability adjustment | 9.30% |  | (1.00%) |
Research & development credit (in Dollars) | $ (90) |  | $ (125) |
Research & development credit | 20.40% |  | 11.30% |
Other items (in Dollars) | $ 37 |  | $ (21) |
Other items | (8.40%) |  | 2.00% |
Income tax (benefit) expense (in Dollars) | $ (71) |  | $ 882 |
Income tax (benefit) expense | 16.10% |  | (79.70%) |

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