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8. Income Taxes (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Deferred tax asset:    
Net operating loss carryforward $ 17,031 $ 16,948
Expenses capitalized under IRC 263(a) 37 37
Tax credits (AMT) 57 57
Valuation allowance (17,125) (17,042)
Total deferred tax asset $ 0 $ 0