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Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
NOLs - Foreign $ 3,841 $ 4,551
Stock-based compensation 1,474 5,382
Deferred rent liability 1,257 2,024
NOLs - U.S. 909 1,611
Accrued expenses 526 4,552
Unrealized losses 72 101
Other 416 227
Deferred tax assets 8,495 18,448
Deferred tax liabilities    
Unrealized gains 1,718  
Fixed assets 1,498 2,405
Goodwill and intangible assets 388 301
Incentive compensation   1,365
Deferred tax liabilities 3,604 4,071
Total deferred tax assets less deferred tax liabilities 4,891 14,377
Less: valuation allowance (3,841) (4,551)
Deferred tax assets, net $ 1,050 $ 9,826