Accrued and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Product Warranty Liability [Line Items]
Royalties and other fulfillment costs	$ 75,731	$ 1,989
Employee compensation, commissions and benefits	6,242	4,444
Sales, VAT and other taxes payable	3,706	785
Operating Lease, Liability, Current	4,890	0
Other	7,321	4,094
Total accrued and other liabilities	97,890	$ 11,312
Napster [Member]
Product Warranty Liability [Line Items]
Royalties and other fulfillment costs	73,700
Prepaid Royalties	$ 12,800