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Summary of Significant Accounting Policies (Rollforward of Aggregate Allowance for Bad Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract] |  |  |
Balance at beginning of period | $ (1,508) | $ (2,535) | $ (7,033)
Bad debt charge | (1,165) | 341 | 77
Adjustment associated with reversal of allowance on Mutamba | 593 |  |
Adjustment associated with settlement of customs audit |  | 623 |
Reclassification to leasehold costs related to signing bonus |  |  | 4,197
Foreign currency gain | (193) | 63 | 224
Balance at end of period | $ (2,273) | $ (1,508) | $ (2,535)

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