Additional Financial Statement Information (Other Accrued Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Customer advance payments	$ 4,561	$ 5,328
Accrued restructuring	604	159
Goods received, not yet invoiced	1,561	1,819
Accrued taxes, other than income taxes	1,167	2,293
Accrued commissions	2,149	2,203
Accrued professional fees	1,082	1,775
Lease liability - current	2,827
Other	5,002	3,454
Accrued liabilities, current	$ 18,953	$ 17,031