Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Schedule of Operating Leases) (Details)

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Commitments and Contingencies (Schedule of Operating Leases) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease cost    
Operating lease cost $ 1,240 $ 2,378
Variable lease cost 1,040 3,200
Operating lease expense 2,280 5,578
Short-term lease rent expense 20 17
Total rent expense 2,300 5,595
Other information    
Operating cash flows from operating leases 1,207 2,377
Right of use assets exchanged for new operating lease liabilities $ 2,664
Weighted-average remaining lease term - operating leases   6 months
Weighted-average discount rate - operating leases   10.00%