Concentration of Business Risk (Details)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2012 Revenue Partner A	Sep. 30, 2011 Revenue Partner A	Sep. 30, 2012 Revenue Partner A	Sep. 30, 2011 Revenue Partner A	Sep. 30, 2012 Revenue Partner B	Sep. 30, 2011 Revenue Partner B	Sep. 30, 2012 Revenue Partner B	Sep. 30, 2011 Revenue Partner B	Sep. 30, 2012 Revenue Partner C	Sep. 30, 2011 Revenue Partner C	Sep. 30, 2012 Revenue Partner C	Sep. 30, 2011 Revenue Partner C	Sep. 30, 2012 Revenue Partner D	Sep. 30, 2011 Revenue Partner D	Sep. 30, 2012 Revenue Partner D	Sep. 30, 2011 Revenue Partner D	Sep. 30, 2012 Contract receivables item	Sep. 30, 2012 Contract receivables item	Sep. 30, 2012 Contract receivables Contract receivables, Significant Partner One	Dec. 31, 2011 Contract receivables Contract receivables, Significant Partner One
Concentration of business risk
Concentration percentage with significant partner	41.00%	80.00%	78.00%	75.00%	18.00%	10.00%	7.00%	16.00%	21.00%	0.00%	7.00%	0.00%	13.00%	0.00%	2.00%	0.00%			82.00%	85.00%
Number of significant partners																	1	1