Summary of Impact of Restatements on Each Affected Line of Consolidated Statements of Operations (Detail) (USD $) In Thousands, 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
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
As Reported
Revenues		21,347	23,621	21,544		16,905		17,680	16,426	45,165	34,106	66,512	51,011	87,493	66,185	64,345
Cost of revenues:
Platform commissions, royalties and other		2,194	2,137	2,557		3,223		3,121	3,469	4,694	6,590	6,888	9,813	8,940	12,389	16,643
Impairment of prepaid royalties and guarantees						160		0	371		371		531	0	531	663
Amortization of intangible assets		1,025	932	753		2,375		703	817	1,685	1,520	2,710	3,895	3,783	5,447	4,226
Total cost of revenues		3,219	3,069	3,310		5,758		3,824	4,657	6,379	8,481	9,598	14,239	12,723	18,367	21,532
Gross profit		18,128	20,552	18,234		11,147		13,856	11,769	38,786	25,625	56,914	36,772	74,770	47,818	42,813
Adjustments
Revenues		4,752	5,643	4,965		2,348		1,756	1,186	10,608	2,942	15,360	5,290	20,690	7,840	2,459
Cost of revenues:
Platform commissions, royalties and other		4,752	5,643	4,965		2,348		1,756	1,186	10,608	2,942	15,360	5,290	20,690	7,840	2,459
Impairment of prepaid royalties and guarantees						0		0	0		0		0	0	0	0
Amortization of intangible assets		0	0	0		0		0	0	0	0	0	0	0	0	0
Total cost of revenues		4,752	5,643	4,965		2,348		1,756	1,186	10,608	2,942	15,360	5,290	20,690	7,840	2,459
Gross profit		$ 0	$ 0	$ 0		$ 0		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

[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.