Business Combinations - Pro forma (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Revenue	$ 46,309	$ 51,381	$ 48,363	$ 54,528	$ 61,030	$ 63,250	$ 56,150	$ 69,470	$ 200,581	$ 249,900	$ 223,146
Net loss	(17,214)	$ (43,727)	$ (17,949)	$ (8,550)	$ (2,958)	$ 158	$ (5,509)	$ 1,124	(87,440)	(7,185)	8,148
CrowdStar Inc and Plain Vanilla
Business Acquisition [Line Items]
Revenue	2,111
Net loss	$ (9,194)
Total pro forma revenues									245,484	287,828
Pro forma net income									$ (98,863)	$ (28,154)
Pro forma net income (loss) per share - basic									$ (0.75)	$ (0.24)
Pro forma net income (loss) per share - diluted									$ (0.75)	$ (0.24)
Play First and Cie Games
Business Acquisition [Line Items]
Revenue											13,601
Net loss											(315)
Total pro forma revenues											243,971
Pro forma net income											$ 2,800
Pro forma net income (loss) per share - basic											$ 0.03
Pro forma net income (loss) per share - diluted											$ 0.03