6. Stock Option Activity (Details) - 6 months ended Jun. 30, 2015 - USD ($) None in scaling factor is -9223372036854775296	Total
Number of Shares
Number of Shares, Outstanding at beginning of period	2,423,253
Number of Shares, Granted	1,008,026
Number of Shares, Exercised	0
Number of Shares, Forfeited and canceled	(84,687)
Number of Shares, Outstanding at end of period	3,346,592
Number of Shares, Exercisable at end of period	1,546,201
Weighted average exercise price
Weighted average exercise price, Outstanding at beginning of period	$ 2.92
Weighted average exercise price, Granted	$ 0.67
Weighted average exercise price, Exercised
Weighted average exercise price, Forfeited and canceled	$ 1.28
Weighted average exercise price, Outstanding at end of period	2.28
Weighted average exercise price, Exercisable at end of period	$ 3.35
Weighted average remaining contract term
Weighted average remaining contract term, Outstanding at end of period	8 years 2 months 12 days
Weighted average remaining contract term, Exercisable at end of period	7 years 1 month 6 days
Intrinsic Value
Intrinsic Value, Outstanding at end of period
Intrinsic Value, Exercisable at end of period