Commitments and Contingencies - Schedule of Future Minimum Contractual Royalty Payments to Licensors and Marketing Commitments (Detail) $ in Thousands	Sep. 30, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Remaining 2018	$ 1,375
2019	20,699
2020	42,656
Total	$ 64,730

Amount of contractual obligation due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant