Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Deferred tax assets:
NOLs – Foreign	$ 8,222	$ 6,605
Goodwill and intangible assets	1,794	1,841
Accrued expenses	1,358	2,699
Stock-based compensation	1,189	2,673
Net lease liability	1,172	1,184
Capital losses	794	794
NOLs – U.S.	635	762
Other	37	40
Deferred tax assets	15,201	16,598
Deferred tax liabilities:
Fixed assets and prepaid assets	1,439	1,433
Unrealized gains	748	724
Deferred tax liabilities	2,187	2,157
Total deferred tax assets less deferred tax liabilities	13,014	14,441
Less: valuation allowance	(9,016)	(7,399)
Deferred tax assets, net	$ 3,998	$ 7,042