Summary of significant accounting policies (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2013
Summary Of Significant Accounting Policies [Line Items]
Effective rate of income tax	0.00%	0.00%
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)	9,993	9,413
Warrants Antidilutive	1,020,825	920,825
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	110,000	52,677
Cash Equivalents, at Carrying Value	$ 1,455	$ 4,642
Restricted Cash and Cash Equivalents	138	140
Cash Balance Covered Under US Federal Depository Insurance Corporation	652
Escrow Deposit	99	99	99
Rental Deposit	39
Virtual currency liability, Terms of Repayment	once the users virtual currency balance exceeds a certain minimum threshold; a virtual currency balance of $0.01 or $0.02 based upon initial date of enrollment on the site.
Virtual currency liability	10	10
Advertising Expense	$ 199	$ 70
Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance One	100.00%