Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Summary of significant accounting policies (Textual) [Abstract]
Impairment loss			$ 0
Oncology practice combined represented revenue	16.50%	15.30%	15.40%	16.60%
Revenue of all other clients individually			less than 5%
Largest amount of tax benefit			greater than 50%
Income taxes paid			$ 17,000