Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accruals	$ 111	$ 126
Stock compensation	789	1,466
Net operating losses	14,288	20,015
Basis difference in fixed assets		13
Total deferred tax assets	15,188	21,620
Valuation allowance	(15,188)	(21,620)
Total net deferred tax assets