Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Stock compensation expense	$ 3,394	$ 4,631
Goodwill	2,673	3,110
Royalty accruals - BJFT	992	0
Bad debt allowance - BJFT	333	0
Inter-company interest expense accrual - US tax	476	0
Other	637	2,419
Net operating loss carryforwards	1,576	2,006
Credit carry-forwards	359	0
Total deferred tax assets	10,440	12,166
Deferred tax liabilities:
Depreciation	(777)	(1,096)
Intangible assets	(294)	(1,156)
Other	(306)	(306)
Total deferred tax liabilities	(1,377)	(2,558)
Net deferred tax asset before valuation allowance	9,063	9,608
Valuation allowances for deferred tax assets	(7,832)	(2,006)	$ (1,833)	$ (1,868)
Net deferred tax asset	$ 1,231	$ 7,602