Lease Arrangements - Components of Lease Expense (Details) - Selling, General and Administrative Expenses [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Line Items]
Operating lease cost	[1]	$ 133	$ 102	$ 392	$ 565
Amortization of lease assets		706	667	2,155	1,863
Interest on lease liabilities		258	265	765	807
Total lease cost		$ 1,097	$ 1,034	$ 3,312	$ 3,235

[1] Includes short-term leases and variable lease costs, which are not significant for the three and nine months ended September 30, 2020 and 2019.