4. Stockholders' Equity (Details - Option activity) - Stock Options [Member] - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Options
Options outstanding, beginning balance	10,747,558	7,281,250
Options granted	2,783,231	4,130,000
Options exercised	(25,000)	(159,678)
Options forfeited	(2,537,970)	(504,014)
Options outstanding, ending balance	10,967,819	10,747,558	7,281,250
Options exercisable	7,274,946
Options vested	7,607,170
Weighted Average Exercise Price
Weighted average exercise price, Options outstanding, beginning balance	$ 0.67	$ 0.17
Weighted average exercise price, Options granted	3.75	1.53
Weighted average exercise price, Options exercised	0.80	0.13
Weighted average exercise price, Options forfeited	2.30	1.19
Weighted average exercise price, Options outstanding, ending balance	1.47	0.67	$ 0.17
Weighted average exercise price, Options exercisable	0.42
Weighted average exercise price, Options vested	0.50
Intrinsic Value
Intrinsic value, Options outstanding, beginning balance	3.56	0.17
Intrinsic value, Options granted
Intrinsic value, Options exercised	2.62	1.42
Intrinsic value, Options forfeited	1.06	3.36
Intrinsic value, Options outstanding, ending balance	2.80	$ 3.56	$ 0.17
Intrinsic value, Options exercisable	3.00
Intrinsic value, Options vested	$ 2.97
Weighted Average Contractual Term
Weighted average remaining contractual term, Options granted	6 years 2 months 23 days	9 years 9 months
Weighted average remaining contractual term, Options outstanding	6 years 9 months 22 days	7 years 9 months	6 years 9 months
Weighted average remaining contractual term, Options exercisable	5 years 7 months 24 days
Weighted average remaining contractual term, Options vested	5 years 9 months 14 days