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Senior convertible notes (Details Textual) (USD $)	1 Months Ended			1 Months Ended
	Aug. 31, 2010 Senior convertible notes due august 15 2015 [Member]	Sep. 30, 2012 Senior convertible notes due august 15 2015 [Member]	Dec. 31, 2011 Senior convertible notes due august 15 2015 [Member]	Dec. 31, 2006 Senior convertible notes due december 15 2013 [Member]	Sep. 30, 2012 Senior convertible notes due december 15 2013 [Member]	Dec. 31, 2011 Senior convertible notes due december 15 2013 [Member]
Senior convertible notes (Textual) [Abstract]
Principal amount	$ 100,000,000	$ 100,000,000	$ 100,000,000	$ 115,000,000	$ 115,000,000	$ 115,000,000
Senior notes, effective interest rate	5.75%	5.75%		3.75%
Accrued interest		735,000	2,200,000		192,000	1,300,000
No of convertible shares	147.0859			44.5002
Principal amount per share	$ 1,000			$ 1,000
Conversion price of shares		$ 6.80			$ 22.47
Issuance cost	$ 4,200,000			$ 3,700,000
Percentage of repurchase price	100.00%			100.00%
Percentage of redemption price	100.00%
Percentage of conversion price equaling stock price	150.00%
Consecutive trading days	Least 20 of the 30

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The price per share of the conversion feature embedded in the debt instrument.

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