Future Minimum Royalties Payable (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Contractual Obligation [Line Items]
Future minimum royalties payable under license agreements, 2018	$ 6,047
Future minimum royalties payable under license agreements, 2019	292
Future minimum royalties payable under license agreements, 2020	218
Future minimum royalties payable under license agreements, 2021	222
Future minimum royalties payable under license agreements, 2022	226
Future minimum royalties payable under license agreements, Thereafter	156
Total	$ 7,161