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Commitments and Contingencies - Other (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 02, 2019 | Jan. 30, 2019 | Feb. 09, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Commitments and Contingencies |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Rent expenses operating leases |  |  |  | $ 252,000 | $ 107,000 | $ 442,000 | $ 308,000 | $ 420,000 | $ 376,000

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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