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v3.19.3

Subsequent Events - (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
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Aug. 02, 2019 USD ($) | May 03, 2019 | Jan. 30, 2019 USD ($) ft² | Jan. 25, 2019 USD ($) item | Feb. 09, 2016 | Apr. 30, 2016 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 | Sep. 30, 2019 USD ($) | Sep. 30, 2018 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 | Mar. 15, 2019 USD ($)
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 5,000,000 |  | $ 1,000,000 |  |  |  |  |  |  |
Number of equal monthly payments of principal plus accrued interest | item |  |  |  | 36 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.25% |  |  | 4.33% | 4.18% | 4.44% | 3.84% | 4.50% | 3.50% |
Spread (as a percent) |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Period for which base rent is abated | 7 months |  | 7 months |  |  |  |  |  |  |  |  |  |
Annual base rent per month after abatement | $ 18,178 |  | $ 19,646 |  |  |  |  |  |  |  |  |  |
Percentage of annual increase in lease rent | 3.00% |  | 3.00% |  | 3.00% |  |  |  |  |  |  |  |
Future minimum payments |  |  |  |  |  |  | $ 8,918,000 |  | $ 8,918,000 |  | $ 2,275,000 |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 0.1245 |  |  |  |  |  |  |  |  |  |  |
Maximum | Prime rate |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Spread (as a percent) |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Number of equal monthly payments of principal plus accrued interest | item |  |  |  | 36 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.25% |  |  |  |  |  |  |  |  |
Area of office space (in square feet) | ft² |  |  | 14,075 |  |  |  |  |  |  |  |  |  |
Period for which base rent is abated |  |  | 10 months |  |  |  |  |  |  |  |  |  |
Annual base rent per month after abatement |  |  | $ 19,650 |  |  |  |  |  |  |  |  |  |
Percentage of annual increase in lease rent |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
Future minimum payments |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 0.1245 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Maximum | Prime rate |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Spread (as a percent) |  |  |  | (1.00%) |  |  |  |  |  |  |  |  |

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