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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