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Organization and Accounting Policies (Rollforward Analysis of the Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Organization and Accounting Policies [Abstract] |  |  |  |
Balance at beginning of year | $ (1,876) | $ (6,948) | $ (2,535) | $ (7,033)
Bad debt recovery (charge) | (54) | 157 | (30) | 68
Reclassification of leasehold costs related to signing bonus |  | 4,197 |  | 4,197
Adjustment associated with settlement of customs audit |  |  | 623 |
Foreign currency gain | 53 | 13 | 65 | 187
Balance at end of period | $ (1,877) | $ (2,581) | $ (1,877) | $ (2,581)

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