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Income Taxes - Deferred tax assets net (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
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 | $ 0 | $ 0

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