Acquisitions (Details 7) (Mar Cor subsidiary, Gambro Business, USD $)	0 Months Ended
	Oct. 06, 2010 item
Acquisitions
Transaction costs	$ 240,000
Total consideration for the transaction, excluding transaction costs	23,700,000
Portion of purchase price payable in quarterly installments	3,100,000
Number of quarterly installments over which purchase price is payable	6
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Current assets (principally inventories)	3,080,000
Property, plant and equipment	11,000
Current liabilities	(60,000)
Net assets acquired	11,891,000
Number of in-process research and development projects acquired	0
Goodwill deductible for income tax purposes	11,809,000
Period for income tax deduction	15 years
Product and service sales
Acquisitions
Expansion in product and services sales volume (as a percent)	19.00%
Product and service sales | Customer concentration
Acquisitions
Concentration risk (as a percent)	75.00%
Number of major customers	1
Technology
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Amortizable intangible assets	1,170,000
Estimated useful lives	8 years
Customer relationships
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Amortizable intangible assets	6,640,000
Estimated useful lives	11 years 6 months
Non-compete agreement
Purchase price allocation to the assets acquired and assumed liabilities based on estimated fair values
Amortizable intangible assets	$ 1,050,000
Estimated useful lives	14 years