Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deferred tax assets:
NOLs - Foreign	$ 4,347	$ 3,841
Stock-based compensation	1,655	1,474
Deferred rent liability	1,245	1,257
NOLs - U.S.	779	909
Accrued expenses	769	526
Other	255	488
Deferred tax assets	9,050	8,495
Deferred tax liabilities:
Unrealized gains	1,716	1,718
Fixed assets	1,498	1,498
Goodwill and intangible assets	436	388
Deferred tax liabilities	3,650	3,604
Total deferred tax assets less deferred tax liabilities	5,400	4,891
Less: valuation allowance	(4,347)	(3,841)
Deferred tax assets, net	$ 1,053	$ 1,050