Concentration of Credit Risk (Details) (USD $)			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Sta Instruments Instruments
Concentration of Credit Risk (Textual) [Abstract]
Number of instrument on purchase agreement			12,000
Payment of materials in advance	$ 2,788,000	$ 2,827,000
Number of instrument remaining on purchase order			7,935