Segment Information (Segment Results) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 16,557								$ 69,510	$ 78,718	$ 81,479
Cost of Goods and Services Sold									17,727	23,164	27,548
Gross profit	12,830	$ 13,340	$ 11,099	$ 14,514	$ 13,900	$ 13,214	$ 15,318	$ 13,122	51,783	55,554	53,931
Operating expenses									74,054	76,185	92,674
Operating (loss) income	$ (5,556)	$ (4,928)	$ (6,833)	$ (4,954)	$ (4,757)	$ (4,459)	$ (3,166)	$ (8,249)	(22,271)	(20,631)	(38,743)
Consumer Media
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									18,168
Mobile Services
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									29,670
Games
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									21,672
Operating Segments | Consumer Media
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									18,168	22,569	25,051
Cost of Goods and Services Sold									3,858	4,460	7,074
Gross profit									14,310	18,109	17,977
Operating expenses									14,419	14,530	18,399
Operating (loss) income									(109)	3,579	(422)
Operating Segments | Mobile Services
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									29,670	30,752	31,289
Cost of Goods and Services Sold									8,623	10,021	12,606
Gross profit									21,047	20,731	18,683
Operating expenses									28,066	27,970	34,439
Operating (loss) income									(7,019)	(7,239)	(15,756)
Operating Segments | Games
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									21,672	25,397	25,139
Cost of Goods and Services Sold									6,123	8,710	7,919
Gross profit									15,549	16,687	17,220
Operating expenses									20,324	20,401	19,644
Operating (loss) income									(4,775)	(3,714)	(2,424)
Corporate
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold									(877)	(27)	(51)
Operating expenses									11,245	13,284	20,192
Operating (loss) income									$ (10,368)	$ (13,257)	$ (20,141)