Leases - Other (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Leases
Operating ROU assets	$ 2,300,000		$ 2,300,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net		Property, Plant and Equipment, Net
Operating lease liabilities	$ 2,285,000		$ 2,285,000
Weighted-average remaining lease term (in years)	8 years 8 months 12 days		8 years 8 months 12 days
Weighted-average discount rate (as a percent)	4.00%		4.00%
Operating lease cost	$ 86,000		$ 202,000
Short-term operating lease expense	$ 20,000	$ 41,000		$ 127,000
Short-term operating lease expense			$ 71,000
Minimum
Leases
Remaining lease terms (in years)			1 year
Maximum
Leases
Remaining lease terms (in years)			10 years