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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