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Income Taxes (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Taxes [Abstract]            
Provision for income taxes $ 314   $ 92 $ 124 $ 399  
Effective tax rate (153.90%)   (17.90%) (13.60%) 112.40%  
U.S. statutory federal income tax rate       21.00%    
Income Tax Examination [Abstract]            
Probability of uncertain tax position to be recognized       50.00%    
Percentage of tax position realized upon ultimate settlement       50.00%    
ASU 2016-09 [Member]            
Income Tax Examination [Abstract]            
Immaterial error correction amount   $ 1,200        
Immaterial error correction (in dollars per share)   $ 0.06        
Classification error between deferred tax asset and deferred tax liability           $ 700
Sweden [Member]            
Income Tax Examination [Abstract]            
Income tax examination, year under examination       2011    
China [Member]            
Income Tax Examination [Abstract]            
Income tax examination, year under examination       2015    
India [Member]            
Income Tax Examination [Abstract]            
Income tax examination, year under examination       2015    
UK [Member]            
Income Tax Examination [Abstract]            
Income tax examination, year under examination       2016    
Federal [Member]            
Income Tax Examination [Abstract]            
Income tax examination, year under examination       1997    
State [Member]            
Income Tax Examination [Abstract]            
Income tax examination, year under examination       1997