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Income Tax - (Narratives) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Income Tax [Abstract]                    
Effective Income Tax Rate                 46.10% 23.10%
Income tax expense (benefit) $ (3,260) $ (652) $ (369) $ 605 $ (464) $ (19) $ (115) $ (7) $ (3,676) $ (605)
US Federal Income Tax Rate                   35.00%
US Federal Income Tax Rate, based on Tax Cuts And Jobs Act Of 2017                 21.00%  
Tax provision for the impact of the remeasurement of deferred tax assets and liabilities                   $ 3,200
Increase (Decrease) In Income Taxes Resulting From Release Of Uncertain Tax Position Liability Due To Expiration Of Statute Of Limitations                 $ 94  
Transition tax on the mandatory deemed repatriation of foreign earnings                   3,000
Discontinued Operation, Tax Effect of Discontinued Operation                 (441) (617)
Deferred Tax Assets, Valuation Allowance 13,899       11,447       13,899 11,447
Cash In Foreign Subsidiaries 3,200       4,800       3,200 4,800
Tax Liability On Foreign Earnings Repatriated 38       38       38 38
German income tax audit was settled                   30
Unrecognized Tax Benefits, Increase Resulting from Audits                 200  
Additions based on tax positions of acquired entities                 1,389  
Unrecognized Tax Benefits, Increase Resulting from Credits                 800  
Unrecognized Tax Benefits, Increase Resulting from State Income Tax Issues                 500  
Unrecognized Tax Benefits, Decrease Resulting from Acquisition                 500  
Income Tax Disclosure                    
Deferred Tax Assets, Net 10,373       2,037       10,373 2,037
Research and development tax credit carryforwards offset by reserve for uncertain tax positions 1,000               1,000  
Alternative minimum tax credit carryforwards 800               800  
State investment tax credit carryforwards, research and development tax credit carryforwards, and EZ credit carryforwards 3,800               3,800  
Accrued Penalties and Interest, Income Tax 100       15       100 15
Penalties and Interest Expense                 31 5
Expire in 2020 [Member]                    
Income Tax Disclosure                    
Research and development tax carryforward 8,600               8,600  
Foreign tax credits carryforward 200               200  
ASU 2016-09                    
Income Tax Disclosure                    
Deferred Tax Assets, Net         $ 500         $ 500
Federal                    
Income Tax Disclosure                    
Operating loss carryforwards 27,200               27,200  
Federal | Expire between 2019 and 2037 [Member]                    
Income Tax Disclosure                    
Operating loss carryforwards 21,900               21,900  
State | Expire between 2019 and 2037 [Member]                    
Income Tax Disclosure                    
Operating loss carryforwards $ 17,500               $ 17,500