Segment Information (Revenue by Geographic Region) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Geographic Reporting Disclosure [Line Items]
Revenue	$ 35,506	$ 34,157	$ 40,825	[1]	$ 45,724	$ 50,595	[2]	$ 48,958	$ 49,850	[1]	$ 56,793	$ 156,212	[3]	$ 206,196	[3]	$ 258,842	[3]
United States
Geographic Reporting Disclosure [Line Items]
Revenue												61,660		90,250		117,844
Europe
Geographic Reporting Disclosure [Line Items]
Revenue												26,575		38,155		56,473
Republic of Korea
Geographic Reporting Disclosure [Line Items]
Revenue												39,852		46,601		40,467
Rest of World
Geographic Reporting Disclosure [Line Items]
Revenue												$ 28,125		$ 31,190		$ 44,058

[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] In the quarter ended December 31, 2013, we sold our remaining shares of common stock in LoEn Entertainment for a net gain of $21.4 million, as described in further detail in Note 5.

[3] December 31, 2012 December 31, 2011 December 31, 2010Components of Cost of Revenue License Fees8,012 8,538 11,689Service Revenue68,369 70,553 92,042Net Revenue Costs76,381 79,091 103,731