CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net (loss)/income	$ (87,440)	$ (7,185)	$ 8,148
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	2,947	2,861	2,513
Impairment and amortization of intangible assets (including impairment and amortization of intangible assets acquired from a related party of $5,000, $0, and $0 as of December 31, 2016, December 31, 2015, and December 31, 2014, respectively)	14,792	9,754	5,275
Change in fair value of investments	1,900		835
Non-cash foreign currency remeasurement loss	999	792	1,495
Stock-based compensation	13,263	11,686	11,633
Non-cash warrant (benefit)/expense	(55)	2,009	1,192
Other non-cash income tax expense			1,531
Impairment of prepaid royalties and minimum guarantees (including impairment of prepaid royalties and minimum guarantees paid to a related party of $9,866, $0, and $0 as of December 31, 2016, December 31, 2015, and December 31, 2014, respectively)	30,107	2,502	257
Impairment on investments	2,600
Changes in allowance for doubtful accounts	(120)	418	(162)
Changes in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable	402	13,408	(9,195)
Prepaid royalties	(16,675)	(31,776)	(5,209)
Prepaid expenses and other assets	(2,336)	2,049	(9,123)
Accounts payable and other accrued liabilities	3,135	(1,701)	(4,298)
Accrued liabilities	65	(259)	(20)
Accrued compensation	4,577	(3,639)	5,259
Accrued royalties and license fees	55	(5,070)	10,231
Deferred revenue	12,251	(6,208)	18,810
Accrued restructuring	(70)	342
Other long-term liabilities	(181)	(1,448)	(8,598)
Net cash (used in)/generated from operating activities	(19,784)	(11,465)	30,574
Cash flows from investing activities:
Purchase of property and equipment	(3,070)	(2,751)	(3,292)
Net cash paid for acquisitions	(36,660)	(1,914)	(22,586)
Increase/decrease in restricted cash	186	492	(60)
Investments in Plain Vanilla Corp. and Diary Free Games, Inc. (Note 6)	(9,500)
Purchase of intangible assets (including purchase of intangible assets from a related party of $2,500, $0, and $0 as of December 31, 2016, December 31, 2015, and December 31, 2014, respectively)	(2,500)	(2,500)
Other investing activities		(251)	(250)
Net cash used in investing activities	(51,544)	(6,924)	(26,188)
Cash flows from financing activities:
Payments on acquired line of credit and term loans	(1,885)		(2,340)
Proceeds from public offering, net of issuance costs			32,058
Proceeds from exercise of stock options and purchases under the ESPP	2,172	5,449	7,347
Taxes paid related to net share settlement of equity awards	(2,405)	(3,018)	(896)
Excess tax benefit from stock awards		107
Cash paid to acquire non-controlling interest in Crowdstar	(4,667)
Proceeds from exercise of stock warrants and issuance of common stock		676	2,786
Proceeds from private offering, net of issuance costs		125,156
Net cash (used in)/provided by financing activities	(6,785)	128,370	38,955
Effect of exchange rate changes on cash	(327)	(351)	(925)
Net (decrease)/increase in cash and cash equivalents	(78,440)	109,630	42,416
Cash and cash equivalents at beginning of period	180,542	70,912	28,496
Cash and cash equivalents at end of period	102,102	180,542	70,912
Supplemental disclosure of cash flow information
Common stock issued for acquisitions			61,861
Common stock issued as contingent consideration earned			5,821
Income taxes paid	$ 174	$ 310	$ 303