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8. Stock-Based Compensation (Details 2) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Market value per share on grant date	$ 2.56	$ 4.06
Equity Option [Member]
Dividend-yield	0.00%	0.00%
Risk-free interest rate	1.66%	1.61%
Expected volatility	77.69%	76.55%
Expected life (years)	6 years 11 months 26 days	5 years 4 months 24 days
Market value per share on grant date	$ 2.52	$ 3.69
Weighted average fair value per share of common stock	$ 1.79	$ 2.27

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