Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Rollforward Analysis of the Allowance Against Accounts Receivable Balance) (Details)

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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
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)