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v3.19.3

Term Loan - Other (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 25, 2019 USD ($) item | Apr. 30, 2016 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Face amount | $ 5,000,000 | $ 1,000,000 |  |  |  |  |  |
Spread (as a percent) |  | 1.00% |  |  |  |  |  |
Interest rate (as a percent) | 4.25% |  | 4.33% | 4.18% | 4.44% | 3.84% | 4.50% | 3.50%
Number of equal monthly payments of principal plus accrued interest | item | 36 |  |  |  |  |  |  |
Interest expense |  |  | $ 56,000 | $ 7,000 | $ 155,000 | $ 20,000 | $ 25,000 | $ 30,000
Prime rate | Maximum |  |  |  |  |  |  |  |
Spread (as a percent) | 1.00% |  |  |  |  |  |  |

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