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Summary of Significant Accounting Policies (Rollforward Analysis of the Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Abstract] |  |  |
Balance at beginning of year | $ (2,535) | $ (7,033) | $ (5,211)
Bad debt recovery (charge) | 341 | 77 | (452)
Reclassification of leasehold costs related to signing bonus |  | 4,197 |
Reclassification of Sojitz acquisition |  |  | (694)
Adjustment associated with settlement of customs audit | 623 |  |
Foreign currency gain | 63 | 224 | (676)
Balance at end of period | $ (1,508) | $ (2,535) | $ (7,033)

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