Allowance for Doubtful Accounts Receivable and Sales Returns (Additional Information) (Detail) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	[1]	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	[1]	Dec. 31, 2015 USD ($) Customer		Dec. 31, 2014 USD ($) Customer		Dec. 31, 2013 USD ($) Customer
Concentration Risk [Line Items]
Net revenue	$ 29,922	$ 30,823	$ 33,954	$ 30,597		$ 35,506	$ 34,157	$ 40,825	$ 45,724		$ 125,296	[2]	$ 156,212	[2]	$ 206,196	[2]
Accounts Receivable | Company A
Concentration Risk [Line Items]
Number of major customers | Customer											1		1
Percentage by major customer											52.00%		21.00%
Accounts Receivable | Company B
Concentration Risk [Line Items]
Number of major customers | Customer											1		1
Percentage by major customer											12.00%		15.00%
Mobile Entertainment
Concentration Risk [Line Items]
Net revenue											$ 65,407		$ 79,901		$ 81,181
Mobile Entertainment | Revenue by Segment
Concentration Risk [Line Items]
Number of major customers | Customer											1		1		1
Percentage by major customer											26.00%		20.00%		13.00%
Net revenue											$ 32,900		$ 31,900		$ 26,400
RealPlayer Group
Concentration Risk [Line Items]
Net revenue											$ 29,141		$ 39,201		$ 75,206
RealPlayer Group | Revenue by Segment
Concentration Risk [Line Items]
Number of major customers | Customer															1
Percentage by major customer															13.00%
Net revenue															$ 27,000

[1] In the quarter ended March 31, 2014, certain accrued royalty liabilities of $10.6 million associated with our historical music business, which had originally been recorded based on statutory rates, were extinguished.

[2] December 31, 2013 December 31, 2012 December 31, 2011Components of Revenue License Fees28,422 28,308 43,709Service Revenue96,874 127,904 162,487Net Revenue125,296 156,212 206,196