8. Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred tax asset:
Net operating loss carryforward	$ 17,325	$ 17,119
Expenses capitalized under IRC 263(a)	37	37
Tax credits (AMT)	57	57
Valuation allowance	(17,419)	(17,213)
Total deferred tax asset	$ 0	$ 0