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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Inventory valuation $ 6,334 $ 8,244
Net operating losses and credit carry forwards 53,918 39,750
Warranty and installation accruals 3,022 2,452
Share-based compensation 12,461 11,794
Other 5,787 2,647
Total deferred tax assets 81,522 64,887
Valuation allowance (56,273) (34,909)
Net deferred tax assets 25,249 29,978
Deferred tax liabilities:    
Purchased intangible assets 32,550 34,018
Undistributed earnings 618 1,047
Depreciation 1,908 2,274
Total deferred tax liabilities 35,076 37,339
Net deferred taxes (9,827) $ (7,361)
Undistributed earnings of foreign subsidiaries 100,100  
Income taxes    
Increase in valuation allowance 21,400  
Tax effect of amortization of intangible assets not expected to reverse within the Company's net operating loss carryforward period 11,200  
Federal    
Income taxes    
Net operating loss carryforwards 87,800  
Federal | Research and development tax credit carryforward    
Income taxes    
Net tax credit carryforwards 11,000  
State    
Income taxes    
Net operating loss carryforwards 57,800  
Net tax credit carryforwards 9,400  
Net deferred tax asset 2,800  
Foreign    
Income taxes    
Net tax credit carryforwards $ 7,500