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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Taxes |
Schedule of components of loss before income tax | The components of loss before income tax is as follows (in thousands):
|  | 2016 |  | 2015 |  | 2014 |
Domestic |  | $ | (11,375 | ) | $ | (31,335 | ) | $ | (161 | )
Foreign |  |  | (25,000 | ) |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | (36,375 | ) | $ | (31,335 | ) | $ | (161 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Schedule of reconciliation of the effective tax rate to the U.S. Federal statutory rate |
|  | December 31, 2016 |  | December 31, 2015 |  | December 31, 2014 |
Federal tax benefit at statutory rate |  |  | 34 | % |  | 34 | % |  | 34 | %
State tax, net of Federal benefit |  |  | 8 |  |  | 3 |  |  | 6 |
Loss due to change in fair value of convertible preferred stock liability |  |  | — |  |  | (19 | ) |  | — |
Foreign rate differential |  |  | (23 | ) |  | — |  |  | — |
Change in valuation allowance |  |  | (19 | ) |  | (18 | ) |  | (40 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate |  |  | 0 | % |  | 0 | % |  | 0 | %
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Schedule of principal components of the net deferred tax assets | The principal components of the Company's net deferred tax assets are as follows (in thousands)
|  | December 31, 2016 |  | December 31, 2015 |
Net operating loss carryforwards |  | $ | 9,339 |  | $ | 4,671 |
Tax credit carryforwards |  |  | 1,960 |  |  | 445 |
Capitalized tax assets |  |  | 241 |  |  | 528 |
Accruals |  |  | 230 |  |  | 108 |
Stock compensation |  |  | 954 |  |  | 43 |
Other |  |  | 67 |  |  | 71 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred tax assets |  |  | 12,791 |  |  | 5,866 |
Valuation allowance |  |  | (12,791 | ) |  | (5,866 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax assets |  | $ | — |  | $ | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Schedule of unrecognized tax benefits activity |
|  | December 31, 2016 |  | December 31, 2015 |  | December 31, 2014 |
Unrecognized tax benefits beginning of the period |  | $ | 135 |  | $ | — |  | $ | — |
Increase related to the prior year |  |  | 6 |  |  | — |  |  | — |
Increased related to the current year |  |  | 463 |  |  | 135 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrecognized tax benefits, end of the period |  | $ | 604 |  | $ | 135 |  | $ | — |
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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