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Income Taxes (Tables) | 6 Months Ended
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Jun. 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 June 30, 2018 and December 31, 2017 are as follows:
|  | June 30, 2018 |  |  | December 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 |
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 |  |  | 30,466 |  |  |  | 25,631 |  |  |  | 4,835 |
Increases |  |  | 37 |  |  |  | — |  |  |  | 37 |
Foreign currency translation(1) |  |  | (2,164 | ) |  |  | (1,820 | ) |  |  | (344 | )
Balance at June 30, 2018 |  | $ | 28,339 |  |  | $ | 23,811 |  |  | $ | 4,528 |
(1) | The gross unrecognized tax benefits were accrued in British pounds sterling.

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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