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Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Deferred tax assets:    
NOLs - Foreign $ 5,137 $ 3,841
Stock-based compensation 2,034 1,474
Deferred rent liability 1,233 1,257
NOLs - U.S. 779 909
Accrued expenses 1,410 526
Other 298 488
Deferred tax assets 10,891 8,495
Deferred tax liabilities:    
Unrealized gains 1,718 1,718
Fixed assets 1,527 1,498
Goodwill and intangible assets 485 388
Deferred tax liabilities 3,730 3,604
Total deferred tax assets less deferred tax liabilities 7,161 4,891
Less: valuation allowance (5,137) (3,841)
Deferred tax assets, net $ 2,024 $ 1,050