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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Domestic and Foreign Components of Net Loss | The following table presents domestic and foreign components of net loss for the periods presented (in thousands):
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Domestic |  | $ | (34,977 | ) |  | $ | (10,483 | ) |  | $ | (9,515 | )
Foreign |  |  | (2,200 | ) |  |  | (4,375 | ) |  |  | (1,557 | )
Total net loss |  | $ | (37,177 | ) |  | $ | (14,858 | ) |  | $ | (11,072 | )
Summary of Effective Tax Rate of Provision For Income Taxes Differs From Federal Statutory Rate | The effective tax rate of the provision for income taxes differs from the federal statutory rate as follows:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Federal statutory income tax rate |  |  | 34.0 | % |  |  | 34.0 | % |  |  | 34.0 | %
State taxes, net of federal benefit |  |  | 6.5 |  |  |  | (2.7 | ) |  |  | 4.1 |
Warrant revaluation |  |  | (4.3 | ) |  |  | (0.2 | ) |  |  | (5.5 | )
Foreign tax rate difference |  |  | (1.6 | ) |  |  | (11.8 | ) |  |  | (6.8 | )
Change in valuation allowance |  |  | (36.0 | ) |  |  | (19.9 | ) |  |  | (26.5 | )
Other |  |  | 1.4 |  |  |  | 0.6 |  |  |  | 0.7 |
Provision for income taxes |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Components of Deferred Tax Assets | The components of the deferred tax assets are as follows (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 21,501 |  |  | $ | 9,513 |
Depreciation and amortization |  |  | 419 |  |  |  | 480 |
Accruals/other |  |  | 908 |  |  |  | 293 |
Research and development credits & foreign credits |  |  | 1,143 |  |  |  | 285 |
Total deferred tax assets |  |  | 23,971 |  |  |  | 10,571 |
Valuation allowance |  |  | (23,971 | ) |  |  | (10,571 | )
Net deferred tax assets |  | $ | — |  |  | $ | — |
Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Balance at beginning of year |  | $ | 805 |  |  | $ | — |  |  | $ | — |
Additions based on tax positions related to in prior years |  |  | 707 |  |  |  | 690 |  |  |  | — |
Additions based on tax positions related to current year |  |  | 619 |  |  |  | 115 |  |  |  | — |
Balance at end of year |  | $ | 2,131 |  |  | $ | 805 |  |  | $ | — |

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