7. Share-based payments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Payments Details
Nonemployee common stock		$ 31,200
Nonemployee warrants - fully-vested upon issuance	$ 445,390
Nonemployee warrants - service and performance conditions	9,856	$ 4,462
Employee stock options - market price-based	327,000	327,000
Total share-based expense charged against income	$ 782,246	$ 362,662
Impact on net loss per common share: Basic and diluted	$ (0.01)	$ (0.01)