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Significant Risk Concentrations - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Concentration Risk [Line Items]          
Total revenue $ 16,694,000 $ 19,653,000 $ 56,575,000 $ 61,342,000  
Accounts receivable 13,124,000   $ 13,124,000   $ 18,014,000
Extended expiration date one of OEM Distribution agreements for embedded operating systems     Feb. 28, 2019    
Expiration date of OEM Distribution agreements for mobile operating systems, non-EMEA     Apr. 30, 2022    
Rebate credits outstanding 371,000   $ 371,000    
Cost of revenue [Member]          
Concentration Risk [Line Items]          
Allocation of rebate values, percentage     30.00%    
Reduction to marketing expense [Member]          
Concentration Risk [Line Items]          
Allocation of rebate values, percentage     70.00%    
Honeywell International Inc and affiliated entities [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Total revenue   $ 2,900,000   $ 9,100,000  
Honeywell International Inc and affiliated entities [Member] | Credit Concentration Risk [Member]          
Concentration Risk [Line Items]          
Accounts receivable $ 5,100,000   $ 5,100,000   $ 8,700,000
Revenue [Member] | Honeywell International Inc and affiliated entities [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration risk, percentage   15.00%   15.00%  
Accounts receivable [Member] | Honeywell International Inc and affiliated entities [Member] | Credit Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration risk, percentage     39.00%   48.00%