Unaudited Quarterly Consolidated Statement of Operation Data Restated (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended													6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information [Line Items]
Revenues	$ 26,311	$ 26,099		$ 29,264		$ 26,509		$ 17,724		$ 19,253		$ 19,436	$ 17,612	$ 55,773	$ 37,048	$ 81,872	$ 56,301	$ 108,183	$ 74,025	$ 66,804
Cost of revenues:
Platform commissions, royalties and other	7,382	6,946		7,780		7,522		5,126		5,571		4,877	4,655	15,302	9,532	22,248	15,103	29,630	20,229	19,102
Impairment of prepaid royalties and guarantees	0	0		0		0		0		160		0	371		371		531	0	531	663
Amortization of intangible assets	1,073	1,025		932		753		1,552		2,375	[1]	703	817	1,685	1,520	2,710	3,895	3,783	5,447	4,226
Total cost of revenues	8,455	7,971		8,712		8,275		6,678		8,106		5,580	5,843	16,987	11,423	24,958	19,529	33,413	26,207	23,991
Gross profit	17,856	18,128		20,552		18,234		11,046		11,147		13,856	11,769	38,786	25,625	56,914	36,772	74,770	47,818	42,813
Operating expenses:
Research and development	13,566	9,979	[2]	15,697		15,033	[2]	12,660	[3]	10,808	[3]	8,439	7,166					54,275	39,073	25,180
Sales and marketing	6,272	5,545		4,701		4,375		3,930		3,576		3,344	3,757					20,893	14,607	12,140
General and administrative	3,356	2,466		4,556		4,366		3,814		3,748		3,506	2,934					14,744	14,002	13,108
Amortization of intangible assets	495	495		495		495		495		330		0	0					1,980	825	205
Impairment of goodwill	0	3,613	[4]	0		0		0		0		0	0					3,613	0	0
Restructuring charge	838	213		320		0		(92)		0		147	490					1,371	545	3,629
Total operating expenses	24,527	22,311		25,769		24,269		20,807		18,462		15,436	14,347					96,876	69,052	54,262
Income (loss) from operations	(6,671)	(4,183)		(5,217)		(6,035)		(9,761)		(7,315)		(1,580)	(2,578)					(22,106)	(21,234)	(11,449)
Interest and other income (expense), net	264	(455)		210		(366)		(106)		344		329	180					(347)	747	(1,265)
Loss before income taxes	(6,407)	(4,638)		(5,007)		(6,401)		(9,867)		(6,971)		(1,251)	(2,398)					(22,453)	(20,487)	(12,714)
Income tax benefit (provision)	(660)	1,075	[5]	2,019	[5]	(440)		(152)		813	[6]	(501)	(774)					1,994	(614)	(709)
Net loss	$ (7,067)	$ (3,563)		$ (2,988)		$ (6,841)		$ (10,019)		$ (6,158)		$ (1,752)	$ (3,172)					$ (20,459)	$ (21,101)	$ (13,423)
Net loss per share - basic and diluted	$ (0.11)	$ (0.06)		$ (0.05)		$ (0.11)		$ (0.16)		$ (0.10)		$ (0.03)	$ (0.06)					$ (0.32)	$ (0.37)	$ (0.38)

[1] Amortization of intangible assets of $2,375 in the third quarter of 2011 was driven by increased amortization expense associated with intangible assets acquired in the acquisitions of Griptonite and Blammo.

[2] Changes in the research and development expense from $15,033 in the first quarter of 2012 and $9,979 in the third quarter of 2012 was due primarily to changes in the fair market value of contingent consideration issued to employees who are former shareholders of Blammo.

[3] Research and development expense of $10,808 and $12,660 in the third and fourth quarters of 2011 were related to additional personnel and facility costs associated with the acquisitions of Griptonite and Blammo.

[4] The goodwill impairment charge of $3,613 in the third quarter of 2012 was due to a decline in the estimated fair value of the APAC reporting unit attributable to an accelerated decline in the local feature phone business and the recent restructuring of the Company's operations in the region.

[5] The income tax benefit of $2,019 in the second quarter of 2012 was due primarily to the release of uncertain tax positions in certain foreign jurisdictions due to the expiration of the statute of limitations. The income tax benefit of $1,075 in the third quarter of 2012 was due primarily to the release of the GameSpy valuation allowance upon acquisition and changes in pre-tax income in certain foreign entities.

[6] The income tax benefit of $813 in the third quarter of 2011 was due primarily to the release of the valuation allowance associated with the acquisition of Griptonite.