Restricted stock outstanding and exercisable (Details) (USD $)	Number Outstanding (Restricted Stock Outstanding)	Weighted Average Grant Date Price (Restricted Stock Outstanding)	Number Vested (Restricted Stock Exercisable)	Weighted Average Grant Date Price (Restricted Stock Exercisable)
Balance Grant date at Dec. 31, 2013	0			0
Grant date Price 0.15	$ 10,000,000			$ 0
Grant date Price 0.18	$ 3,000,000
Total Grant date Price	$ 13,000,000	$ 0.16	$ 0	$ 0
Balance Grant date at Dec. 31, 2014	0			0