Annual report pursuant to Section 13 and 15(d)

Leases (Schedule of Lease Expense) (Details)

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Leases (Schedule of Lease Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease cost $ 678 $ 1,240 $ 2,378
Variable lease cost [1] 51 1,040 3,200
Operating lease expense 729 2,280 5,578
Short-term lease rent expense 19 20 17
Total rent expense $ 748 $ 2,300 $ 5,595
[1] Amounts primarily include common area maintenance and utility charges not included in the measurement of right of use assets and operating lease liabilities.