Significant Risk Concentrations - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Concentration Risk [Line Items]
Accounts receivable	$ 15,893,000	$ 16,095,000	$ 12,811,000	$ 13,614,000	$ 12,639,000	$ 16,586,000	$ 15,013,000	$ 17,714,000
Expiration date one of OEM Distribution agreements for embedded operating systems	Jun. 30, 2014
Expiration date of OEM Distribution agreements for mobile operating systems, non-EMEA	Jun. 30, 2014
Revenue	73,404,000	75,840,000
Cost of revenue-service [Member]
Concentration Risk [Line Items]
Earnings under the rebate program	774,000	888,000
Reduction in marketing expense in the future [Member]
Concentration Risk [Line Items]
Earnings under the rebate program	409,000
Korea [Member]
Concentration Risk [Line Items]
Rights expired for Windows Mobile operating systems in Korea	Oct. 31, 2012
Korea [Member] | Windows Mobile Operating Systems [Member]
Concentration Risk [Line Items]
Revenue		4,500,000
Bluebird Soft, Inc. [Member]
Concentration Risk [Line Items]
Accounts receivable		2,100,000
Future Electronics, Inc. [Member]
Concentration Risk [Line Items]
Accounts receivable	3,700,000
Mitsubishi Electric Corporation [Member]
Concentration Risk [Line Items]
Accounts receivable	$ 2,800,000
Revenue [Member] | Other customer [Member]
Concentration Risk [Line Items]
Number of other customer account as major customer	0	0
Revenue [Member] | Maximum [Member] | Other customer [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%
Accounts receivable [Member] | Other customer [Member]
Concentration Risk [Line Items]
Number of other customer account as major customer	0	0
Accounts receivable [Member] | Bluebird Soft, Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		13.00%
Accounts receivable [Member] | Future Electronics, Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%
Accounts receivable [Member] | Mitsubishi Electric Corporation [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	18.00%
Accounts receivable [Member] | Maximum [Member] | Other customer [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%