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13. Income Tax (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |
Income tax expense (benefit) at the federal statutory rate | $ (10,799) | $ (5,314)
Tax Rate Re-measurement - 2017 Tax Cut | 19,600 | 0
State tax expense (benefit) | (1,689) | (775)
Foreign tax rate differential | 1,154 | (401)
Stock-based compensation | 299 | 152
Interest Expense | 33 | 26
Other | (24) | 127
Credits | (24) | (24)
Valuation Allowance | (8,544) | 6,215
Income Tax Expense | $ 6 | $ 6
Effective Tax Rate | (0.02%) | (0.04%)

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