Subsequent event (Narrative) (Details) (USD $)	0 Months Ended
	Jul. 01, 2014
Proceeds from Issuance of Private Placement	$ 7,500,000
Subsequent Event [Member]
Proceeds from Issuance of Private Placement	7,500,000
Equity Issuance, Per Share Amount	$ 1.15
Price per warrant	$ 1.60
Restriction period duration	12 months
General and administrative expenses	4,000,000
Program expenditures	2,700,000
Additional expenses	$ 800,000