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9. Stock-Based Compensation (Details 2) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Market value per share on grant date	$ 1.43	$ 2.56
Equity Option [Member]
Dividend-yield	0.00%	0.00%
Risk-free interest rate	2.22%	1.66%
Expected volatility	76.96%	77.69%
Expected life (years)	6 years 5 months 1 day	6 years 11 months 26 days
Market value per share on grant date	$ 1.41	$ 2.52
Weighted average fair value per share of common stock	$ .99	$ 1.79

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