Lease Arrangements - Components of Lease Expense (Details) - Selling, General and Administrative Expenses [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Leases [Line Items]
Operating lease cost	[1]	$ 172	$ 101
Amortization of lease assets		748	748
Interest on lease liabilities		242	262
Total lease cost		$ 1,162	$ 1,111

[1] Includes short-term leases and variable lease costs, which are not significant for the three months ended March 31, 2021 and 2020.