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Significant Risk Concentrations - Additional Information (Detail) (USD $)
 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Agreement
Dec. 31, 2013
Sep. 30, 2014
Cost of revenue- service [Member]
Sep. 30, 2013
Cost of revenue- service [Member]
Sep. 30, 2014
Cost of revenue- service [Member]
Sep. 30, 2013
Cost of revenue- service [Member]
Sep. 30, 2014
Reduction in marketing expense in the future [Member]
Sep. 30, 2014
Reduction in marketing expense in the future [Member]
Dec. 31, 2013
Future Electronics, Inc. [Member]
Dec. 31, 2013
Mitsubishi Electric Corporation [Member]
Sep. 30, 2014
Revenue [Member]
Future Electronics, Inc. [Member]
Customer Concentration Risk [Member]
Customer
Sep. 30, 2014
Revenue [Member]
Future Electronics, Inc. [Member]
Customer Concentration Risk [Member]
Customer
Sep. 30, 2014
Revenue [Member]
Other customer [Member]
Customer Concentration Risk [Member]
Customer
Sep. 30, 2013
Revenue [Member]
Other customer [Member]
Customer Concentration Risk [Member]
Customer
Sep. 30, 2014
Revenue [Member]
Other customer [Member]
Customer Concentration Risk [Member]
Customer
Sep. 30, 2013
Revenue [Member]
Other customer [Member]
Customer Concentration Risk [Member]
Customer
Sep. 30, 2014
Revenue [Member]
Other customer [Member]
Customer Concentration Risk [Member]
Minimum [Member]
Sep. 30, 2013
Revenue [Member]
Other customer [Member]
Customer Concentration Risk [Member]
Minimum [Member]
Sep. 30, 2014
Revenue [Member]
Other customer [Member]
Customer Concentration Risk [Member]
Minimum [Member]
Sep. 30, 2013
Revenue [Member]
Other customer [Member]
Customer Concentration Risk [Member]
Minimum [Member]
Dec. 31, 2013
Accounts receivable [Member]
Future Electronics, Inc. [Member]
Credit Concentration Risk [Member]
Sep. 30, 2014
Accounts receivable [Member]
Other customer [Member]
Credit Concentration Risk [Member]
Customer
Dec. 31, 2013
Accounts receivable [Member]
Other customer [Member]
Credit Concentration Risk [Member]
Customer
Sep. 30, 2014
Accounts receivable [Member]
Other customer [Member]
Credit Concentration Risk [Member]
Minimum [Member]
Dec. 31, 2013
Accounts receivable [Member]
Other customer [Member]
Credit Concentration Risk [Member]
Minimum [Member]
Dec. 31, 2013
Accounts receivable [Member]
Mitsubishi Electric Corporation [Member]
Credit Concentration Risk [Member]
Concentration Risk [Line Items]                                                    
Number of customer account as major customer                     1 1 0 0 0 0           0 0      
Concentration risk, percentage                     18.00% 11.00%         10.00% 10.00% 10.00% 10.00% 23.00%     10.00% 10.00% 18.00%
Accounts receivable $ 11,749,000 $ 15,893,000             $ 3,700,000 $ 2,800,000                                
Expiration date one of OEM Distribution agreements for embedded operating systems Jun. 30, 2016                                                  
Number of OEM Distribution agreements for embedded operating systems 2                                                  
Expiration date of OEM Distribution agreements for mobile operating systems, non-EMEA Jun. 30, 2015                                                  
Number of OEM Distribution agreements for mobile operating systems 4                                                  
Earnings under the rebate program     $ 64,000 $ 89,000 $ 233,000 $ 658,000 $ 149,000 $ 543,000