Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017		May 25, 2018
Disaggregation Of Revenue [Line Items]
Net cash flows provided by (used in) operating activities				$ 37,188,000	$ 32,909,000	[1]
Net cash flows provided by (used in) investing activities				(120,519,000)	(38,799,000)	[1]
Net cash flows provided by (used in) financing activities				(75,232,000)	(107,445,000)	[1]
Net income (loss)		$ (911,000)	$ 5,093,000	4,698,000	(4,381,000)
Deferred revenue				28,126,000	$ 13,021,000	[1]
Current deferred revenue recognized		34,600,000		118,200,000
Gram Games [Member]
Disaggregation Of Revenue [Line Items]
Accounts receivables, net		$ 10,700,000		$ 10,700,000			$ 10,747,000
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Contract payment term related to advertising arrangements				30 days
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Contract payment term related to advertising arrangements				60 days
Expected length of unsatisfaction of performance obligations				1 year
Durable Virtual Items [Member]
Disaggregation Of Revenue [Line Items]
Estimated weighted average life of product		9 months	8 months	9 months	9 months
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Consumable Virtual Items [Member]
Disaggregation Of Revenue [Line Items]
Percentage of online game revenue		47.00%	43.00%	46.00%	45.00%
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Durable Virtual Items [Member]
Disaggregation Of Revenue [Line Items]
Percentage of online game revenue		53.00%	57.00%	54.00%	55.00%
ASC Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Net reduction to accumulated deficit opening balance	$ 4,000,000
Increase in accumulated deficit result of net income impact transition adjustment recognized	4,000,000
Net cash flows provided by (used in) operating activities				$ 0
Net cash flows provided by (used in) investing activities				0
Net cash flows provided by (used in) financing activities				0
ASC Topic 606 [Member] | Impact of Changes in Accounting Policies, Effect of Change Higher/(Lower) [Member]
Disaggregation Of Revenue [Line Items]
Net reduction in opening balance of deferred revenue	$ 4,000,000
Net income (loss)		$ 3,002,000		3,940,000
Deferred revenue				$ (3,900,000)

[1] Prior period amounts retrospectively adjusted to reflect the adoption of ASU 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash”. Refer to Note 1 – “Overview and Summary of Significant Accounting Policies” in the notes to the interim consolidated financial statements for further discussion on the adoption.