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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2018
Income Tax Disclosure [Abstract] |
Summary of Deferred Tax Assets Recorded | A summary of the components of the Company’s deferred tax assets at September 30, 2018 and December 31, 2017 are as follows:
|  | September 30, 2018 |  |  | December 31, 2017 |
Deferred tax assets: |  |  |  |  |  |  |  |
NOLs – Foreign |  | $ | 5,747 |  |  | $ | 3,841 |
Stock-based compensation |  |  | 2,206 |  |  |  | 1,474 |
Deferred rent liability |  |  | 1,195 |  |  |  | 1,257 |
NOLs – U.S. |  |  | 762 |  |  |  | 909 |
Accrued expenses |  |  | 1,611 |  |  |  | 526 |
Other |  |  | 207 |  |  |  | 488 |
Deferred tax assets |  |  | 11,728 |  |  |  | 8,495 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Unrealized gains |  |  | 1,666 |  |  |  | 1,718 |
Fixed assets |  |  | 1,495 |  |  |  | 1,498 |
Goodwill and intangible assets |  |  | 522 |  |  |  | 388 |
Prepaid assets |  |  | 85 |  |  |  | — |
Deferred tax liabilities |  |  | 3,768 |  |  |  | 3,604 |
Total deferred tax assets less deferred tax liabilities |  |  | 7,960 |  |  |  | 4,891 |
Less: valuation allowance |  |  | (5,747 | ) |  |  | (3,841 | )
Deferred tax assets, net |  | $ | 2,213 |  |  | $ | 1,050 |
Schedule of Changes in Balance of Gross Unrecognized Tax Benefits | The table below sets forth the aggregate changes in the balance of gross unrecognized tax benefits:
|  | Total |  |  | Unrecognized Tax Benefits |  |  | Interest and Penalties |
Balance on January 1, 2018 |  | $ | — |  |  | $ | — |  |  | $ | — |
Accrued in connection with the ETFS Acquisition |  |  | 38,488 |  |  |  | 31,317 |  |  |  | 7,171 |
Increases |  |  | 227 |  |  |  | — |  |  |  | 227 |
Foreign currency translation(1) |  |  | (3,061 | ) |  |  | (2,491 | ) |  |  | (570 | )
Balance at September 30, 2018 |  | $ | 35,654 |  |  | $ | 28,826 |  |  | $ | 6,828 |
(1) | The gross unrecognized tax benefits were accrued in British pounds sterling.

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