XML 41 R30.htm IDEA: XBRL DOCUMENT v3.7.0.1
Description of Business and Significant Accounting Policies (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
segment
item
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Description Of Business And Significant Accounting Policies [Line Items]      
Foreign currency gain $ (8,000) $ (42,000)  
AAA-rated money market funds $ 15,600,000    
Number of Money Market Funds | item 2    
Accounts receivable allowances $ 433,000   $ 433,000
Number of Reportable Segments | segment 1    
Capitalized development costs of software to be sold or marked $ 0    
Capitalized development costs of software for internal use $ 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 16.00% 18.00%  
As Reseller | Net Accounts Receivable      
Description Of Business And Significant Accounting Policies [Line Items]      
Concentration risk, percentage 14.00%   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%