Redeemable Convertible Preferred Stock (Details 1) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Balance as of January 1, 2013	$ 108,839
Increase of fair value	(936)	(4,095)
Ending balance as of March 31, 2013	$ 109,775

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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+ Details