Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)	Sep. 30, 2019	Sep. 12, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Long-term debt, net	$ 74,266,000		$ 72,500,000
Note Purchase Agreement | Senior Notes
Short-term Debt [Line Items]
Face amount	80,000,000	$ 80,000,000	75,000,000
Front end fees	(1,082,000)		(872,000)
Debt issuance costs	(4,652,000)		(1,902,000)
Back end fees	0		274,000
Long-term debt, net	$ 74,266,000		$ 72,500,000