Accrued and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts Payable and Accrued Liabilities, Current [Abstract]
Royalties and other fulfillment costs	$ 3,094	$ 4,868
Employee compensation, commissions and benefits	5,958	7,711
Sales, VAT and other taxes payable	2,976	5,896
Other	5,292	6,811
Total accrued and other current liabilities	$ 17,320	$ 25,286