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Description of Business and Significant Accounting Policies (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
item
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Description Of Business And Significant Accounting Policies [Line Items]          
Foreign currency gain (loss) $ (4,000) $ (117,000) $ 169,000 $ (164,000)  
AAA-rated money market funds $ 12,100,000   $ 12,100,000    
Number of Money Market Funds | item 2   2    
Accounts receivable allowances $ 431,000   $ 431,000   $ 433,000
Bad debt expense     $ 97,000 $ 24,000  
Number of Reportable Segments | segment     1    
Capitalized development costs of software to be sold or marketed 0   $ 0    
Capitalized development costs of software for internal use $ 0   $ 0    
Stock-based compensation vesting period     4 years    
Computers and appliances          
Description Of Business And Significant Accounting Policies [Line Items]          
Property plant and equipment useful life     3 years    
Furniture and Fixtures          
Description Of Business And Significant Accounting Policies [Line Items]          
Property plant and equipment useful life     5 years    
Minimum          
Description Of Business And Significant Accounting Policies [Line Items]          
Estimated useful life, purchased intangible assets     3 years    
Maximum          
Description Of Business And Significant Accounting Policies [Line Items]          
Estimated useful life, purchased intangible assets     5 years    
Sales Revenue, Net | Appliance Revenue | Maximum          
Description Of Business And Significant Accounting Policies [Line Items]          
Concentration risk, percentage     10.00%    
As Reseller | Sales Revenue, Net          
Description Of Business And Significant Accounting Policies [Line Items]          
Concentration risk, percentage 13.00% 17.00% 14.00% 17.00%  
As Reseller | Net Accounts Receivable          
Description Of Business And Significant Accounting Policies [Line Items]          
Concentration risk, percentage     17.00%   15.00%
As an end customer | Sales Revenue, Net          
Description Of Business And Significant Accounting Policies [Line Items]          
Concentration risk, percentage 1.00% 1.00% 1.00% 1.00%