7. Share-based payments (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Share-based Payments Details
Nonemployee common stock		$ 571,207
Nonemployee warrants - fully-vested upon issuance	445,390
Nonemployee warrants - service and performance conditions	9,856	31,887
Legal Settlement – replacement warrants		1,119,450
Employee stock options - market price-based	327,000	654,000
Total share-based expense charged against income	$ 782,246	$ 2,376,544
Impact on net loss per common share: Basic and diluted	$ (0.01)	$ (0.04)