Basis of Presentation and Summary of Significant Accounting Policies - Future Minimum Rental Payments Under Operating Leases (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Basis of Presentation and Summary of Significant Accounting Policies
2019 (excluding the nine months ended September 30, 2019)	$ 472
2020	1,801
2021	804
2022	826
2023	850
Thereafter	390
Total	5,143
Present Value Adjustment	(604)
Lease liability at September 30, 2019	4,539
Deferred offering costs	$ 200

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Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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