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Acquisitions - ObjectVideo - Consideration Paid and Estimated Fair Value of Assets Acquired (Details) - USD ($)
$ in Thousands
Jan. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 63,591 $ 63,591 $ 24,723
ObjectVideo        
Business Acquisition [Line Items]        
Cash paid, net of working capital adjustment $ 6,000      
Current liabilities (58)      
Goodwill 2,258      
Total estimated tangible and intangible net assets 6,000      
Developed Technology | ObjectVideo        
Business Acquisition [Line Items]        
Intangible assets $ 3,800