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Acquisition - Schedule of Purchase Price Allocation of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Aug. 02, 2017
Dec. 31, 2017
Dec. 31, 2016
Assets acquired:      
Goodwill   $ 18,407 $ 0
ViXS Systems, Inc.      
Business Acquisition [Line Items]      
Purchase price $ 16,975    
Assets acquired:      
Cash and cash equivalents 1,901    
Accounts receivable 968    
Inventories 3,175    
Property and equipment 964    
Other assets 1,562    
Identifiable intangible assets 6,730    
Goodwill 18,407    
Liabilities assumed:      
Accounts payable (1,736)    
Accrued liabilities and other current liabilities (2,832)    
Other noncurrent liabilities (1,633)    
Less net liabilities assumed (1,432)    
ViXS Systems, Inc. | Line of Credit      
Liabilities assumed:      
Debt (4,046)    
ViXS Systems, Inc. | Convertible Debt      
Liabilities assumed:      
Debt $ (6,485)