Debt arrangements (Details Textual) (Convertible Notes Payable [Member], USD $)	1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2013	May 31, 2013	Jun. 30, 2013	Jun. 30, 2013	Jun. 11, 2013	May 10, 2013
Convertible Notes Payable [Member]
Debt Instrument, Face Amount					$ 3,000,000	$ 7,000,000
Debt Instrument, Maturity Date	Jun. 11, 2018	May 10, 2018
Debt Instrument, Interest Rate, Stated Percentage	6.50%		6.50%	6.50%
Debt Instrument Default Interest Rate Percentage	18.00%		18.00%	18.00%
Interest Expense, Debt			75,000	75,000
Debt Instrument, Convertible, Conversion Price	$ 1.55		$ 1.55	$ 1.55
Beneficial Ownership Percentage				9.99%
Debt Instrument Prepayment,Percentage Of Premium	25.00%		25.00%	25.00%
Debt Instrument Unpaid Principal Balance, Percenatge Of Cash Premium Description				If a change in control occurs on or before the third anniversary of a Notes issuance date, the Company would be obligated to pay a cash premium on the unpaid principal balance to the holder of that Note equal to 15.0% if the change in control occurs on or before the first anniversary of the issuance date, 10.0% if the change in control occurs between the first and second anniversaries of the issuance date, and 5.0% if the change in control occurs between the second and third anniversaries of the issuance date.
Debt Instrument, Convertible, Terms of Conversion Feature				The Company has the right to require the holder of a Note to convert the Conversion Amount remaining under the Note if, at any time after the first anniversary of the issuance date, (i) the dollar volume-weighted average price for the common stock on the principal market on which the common stock is then listed or traded exceeds 200% of the Conversion Price for 30 consecutive trading days, and (ii) no equity conditions failure then exists, although the Company is entitled to effect only one mandatory conversion during any 20 consecutive trading days. Shares delivered in connection with a mandatory conversion must be accompanied by a payment in cash equal to the amount of any accrued and unpaid interest with respect to the amount being converted, plus all accrued and unpaid late charges with respect to such amount.
Debt Issuance Cost				916,452
Amortization of Financing Costs			$ 8,000	$ 8,000