Company and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 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	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Organization And Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit	$ 232,302					$ 211,843				$ 232,302	$ 211,843
Net loss from operations										20,459
Estimated average useful life of paying user										3 months
Minimum guaranteed liability	0					300				0	300
Impairment charges to cost of revenues										0	531	663
Goodwill impairment charges	0	3,613	[1]	0	0	0	0	0	0	3,613	0	0
Capitalized internal use software costs										1,598	1,787	117
Amortization of capitalized software costs										(1,014)	(507)	(262)
Advertising expense										$ 12,124	$ 6,114	$ 3,184
Capitalized software costs
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful life										3 years
Minimum
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful life										1 year
Maximum
Organization And Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful life										9 years
Apple
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of Accounts Receivable by Customer Segmentation	44.30%					26.60%				44.30%	26.60%
Google
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of Accounts Receivable by Customer Segmentation	10.80%					10.30%				10.80%	10.30%
Medium Entertainment
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of Accounts Receivable by Customer Segmentation	13.20%									13.20%
Tapjoy
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of Accounts Receivable by Customer Segmentation						18.00%					18.00%
Telecomunicaciones Movilnet
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of Accounts Receivable by Customer Segmentation						11.70%					11.70%

[1] 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.