Surgical Imaging Asset Sale and License Agreement (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of assets and license agreement	$ 0	$ (1,568,000)	$ 0
Novadaq Technologies [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Machinery and Equipment				2,000,000
Regulatory And Commercial Milestones [Member] | Novadaq Technologies [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred Contingent Payments, Maximum Consideration That Can Be Received				$ 1,000,000