Commitments and Contingencies - Future Minimum Rental Payments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
2018 (remaining)	$ 170,000		$ 170,000
2019	934,000		934,000
2020	934,000		934,000
2021	934,000		934,000
2022	934,000		934,000
2023 and thereafter	32,388,000		32,388,000
Total	36,294,000		36,294,000
Other Expenses [Abstract]
Operating Lease, Expense	$ 250,000	$ 313,000	$ 1,200,000	$ 936,000